Feedback-based broadcasting of network coded packets with sidelink

ABSTRACT

Methods, systems, and devices for wireless communications are described. A network node may transmit, to a set of user equipment (UE), a set of network encoded packets generated using a set of packets. A UE of the set of UEs may receive subsets of network encoded packets from the network node and from UEs of the set of UEs forwarding network encoded packets. The UE may decode the subsets of network encoded packets and may determine a set of successfully decoded packets. The UE may transmit feedback to the network node that indicates successfully received or decoded packets. The network node may receive the feedback and may determine a subset of the set of packets that was successfully decoded for each UE providing the feedback. The network node may generate an updated set of network encoded packets and may transmit the updated set to the set of UEs.

CROSS REFERENCE

The present application for patent claims the benefit of U.S.Provisional Patent Application No. 63/050,073 by Zhou et al., entitled“FEEDBACK-BASED BROADCASTING OF NETWORK CODED PACKETS WITH SIDELINK,”filed Jul. 9, 2020, assigned to the assignee hereof, and expresslyincorporated by reference herein.

FIELD OF TECHNOLOGY

The following relates generally to wireless communications and morespecifically to feedback-based broadcasting of network coded packetswith sidelink.

BACKGROUND

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such asLong Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal frequency division multiple access (OFDMA), or discreteFourier transform spread orthogonal frequency division multiplexing(DFT-S-OFDM). A wireless multiple-access communications system mayinclude one or more base stations or one or more network access nodes,each simultaneously supporting communication for multiple communicationdevices, which may be otherwise known as user equipment (UE).

Wireless communications systems may support broadcasting of packets to aplurality of UEs. The transmitter (e.g., a network node, base station,etc.) may broadcast multiple packets to multiple receivers (e.g., UEs).The broadcasting may be repeated blindly without the transmittersidentification of packets that have been received by the receivers.

SUMMARY

The described techniques relate to improved methods, systems, devices,and apparatuses that support feedback-based broadcasting of networkcoded packets with sidelink. Generally, the described techniques providefor a transmitter (e.g., a base station) to leverage feedback fromreceivers (e.g., a user equipment (UE)) for broadcasted packets todetermine which packets of a set to retransmit. For example, a networknode (e.g., a base station) may transmit, to a plurality of UEs, a setof one or more network encoded packets representing a set of one or morepackets identified for broadcast to the plurality of UEs. A UE of theplurality of UEs may receive a first subset of the set of one or morenetwork encoded packets and may receive, via a plurality of sidelinkconnections with the plurality of UEs, a second subset of one or morenetwork encoded packets forwarded after successful receipt by theplurality of UEs from the network node. The UE may decode the firstsubset of one or more network encoded packets and the second subset ofone or more network encoded packets and may determine, based on thedecoding, a set of one or more successfully decoded packets from thenetwork node. The UE may transmit feedback to the network node, wherethe feedback indicates the first and second subsets of network encodedpackets (the successfully received network encoded packets) or the setof one or more successfully decoded packets. The network node mayreceive the feedback and may determine, based on the feedback, a subsetof the set of one or more network encoded packets that was successfullydecoded for each of the one or more of the plurality of UEs providingthe feedback. The network node may generate an updated set of one ormore network encoded packets based on feedback, where the updated set ofone or more packets excludes successfully decoded packets included ineach of the subsets, and may transmit the updated set of one or morenetwork encoded packets to the plurality of UEs.

A method for wireless communication at a UE is described. The method mayinclude receiving, as part of a broadcast from a network node, a firstsubset of one or more network encoded packets, receiving, via aplurality of sidelink connections with a corresponding plurality of UEs,a second subset of one or more network encoded packets forwarded aftersuccessful receipt by the plurality of UEs from the network node,decoding the first subset of one or more network encoded packets and thesecond subset of one or more network encoded packets, and determining,based on the decoding, a set of one or more successfully decoded packetsfrom the network node.

An apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory coupled with the processor,and instructions stored in the memory. The instructions may beexecutable by the processor to cause the apparatus to receive, as partof a broadcast from a network node, a first subset of one or morenetwork encoded packets, receive, via a plurality of sidelinkconnections with a corresponding plurality of UEs, a second subset ofone or more network encoded packets forwarded after successful receiptby the plurality of UEs from the network node, decode the first subsetof one or more network encoded packets and the second subset of one ormore network encoded packets, and determine, based on the decoding, aset of one or more successfully decoded packets from the network node.

Another apparatus for wireless communication at a UE is described. Theapparatus may include means for receiving, as part of a broadcast from anetwork node, a first subset of one or more network encoded packets,means for receiving, via a plurality of sidelink connections with acorresponding plurality of UEs, a second subset of one or more networkencoded packets forwarded after successful receipt by the plurality ofUEs from the network node, means for decoding the first subset of one ormore network encoded packets and the second subset of one or morenetwork encoded packets, and means for determining, based on thedecoding, a set of one or more successfully decoded packets from thenetwork node.

A non-transitory computer-readable medium storing code for wirelesscommunication at a UE is described. The code may include instructionsexecutable by a processor to receive, as part of a broadcast from anetwork node, a first subset of one or more network encoded packets,receive, via a plurality of sidelink connections with a correspondingplurality of UEs, a second subset of one or more network encoded packetsforwarded after successful receipt by the plurality of UEs from thenetwork node, decode the first subset of one or more network encodedpackets and the second subset of one or more network encoded packets,and determine, based on the decoding, a set of one or more successfullydecoded packets from the network node.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting feedbackto the network node, where the feedback indicates the first and secondsubsets of network encoded packets or the set of one or moresuccessfully decoded packets.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting the firstsubset of one or more network encoded packets to the plurality of UEsvia the plurality of sidelink connections.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting a channelstate information message in conjunction with transmitting feedback tothe network node.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the feedback includes atleast one negative acknowledgement message, at least one acknowledgementmessage, or both.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving an indicationof one or more network coding parameters, the one or more network codingparameters including a network coding algorithm, a network encodingfunction, a network encoding matrix, a number of decoding iterations, orany combination thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the indication ofthe one or more network coding parameters may include operations,features, means, or instructions for receiving the one or more networkcoding parameters using medium access control (MAC) control elementsignaling, downlink control information signaling, radio resourcecontrol signaling, or any combination thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the indication ofthe one or more network coding parameters may include operations,features, means, or instructions for receiving an indication to switchfrom one or more prior network coding parameters to the one or morenetwork coding parameters.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting, to thenetwork node, a request for the one or more network coding parameters,where the indication of the one or more network coding parameters may bereceived based on transmitting the request.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the request mayinclude operations, features, means, or instructions for transmittingthe request using medium access control (MAC) control element signalingor uplink control information signaling.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving a thirdsubset of one or more network encoded packets from the network nodebased on transmitting feedback to the network node, where the thirdsubset of one or more network encoded packets may be different from thefirst subset of one or more network encoded packets and the secondsubset of one or more network encoded packets.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the third subset of one ormore network encoded packets may be provided via broadcast signaling.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the third subset of one ormore network encoded packets may be provided via unicast signaling.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting feedbackto the network node via a packet data convergence protocol (PDCP) statusreport, a radio link control (RLC) status report, or a hybrid automaticrepeat request (HARD) message.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting feedbackto the network node in a network coding sub-layer, where the feedbackindicates a decoding status of each packet of the set of one or moresuccessfully decoded packets.

A method for wireless communication at a network node is described. Themethod may include transmitting, to a plurality of UEs, a set of one ormore network encoded packets representing a set of one or more packetsidentified for broadcast to the plurality of UEs, receiving feedbackfrom each of one or more of the plurality of UEs, the feedbackindicating, as respective subsets of the set of one or more networkencoded packets, a combination of successfully received network encodedpackets of the set of one or more network encoded packets andsuccessfully decoded packets of the set of one or more packets,determining, based on the feedback, a subset of the set of one or morenetwork encoded packets that was successfully decoded for each of theone or more of the plurality of UEs providing the feedback, generating,based on the feedback, an updated set of one or more network encodedpackets based on an updated set of one or more packets, where theupdated set of one or more packets excludes successfully decoded packetsincluded in each of the subsets, and transmitting the updated set of oneor more network encoded packets to the plurality of UEs.

An apparatus for wireless communication at a network node is described.The apparatus may include a processor, memory coupled with theprocessor, and instructions stored in the memory. The instructions maybe executable by the processor to cause the apparatus to transmit, to aplurality of UEs, a set of one or more network encoded packetsrepresenting a set of one or more packets identified for broadcast tothe plurality of UEs, receive feedback from each of one or more of theplurality of UEs, the feedback indicating, as respective subsets of theset of one or more network encoded packets, a combination ofsuccessfully received network encoded packets of the set of one or morenetwork encoded packets and successfully decoded packets of the set ofone or more packets, determine, based on the feedback, a subset of theset of one or more network encoded packets that was successfully decodedfor each of the one or more of the plurality of UEs providing thefeedback, generate, based on the feedback, an updated set of one or morenetwork encoded packets based on an updated set of one or more packets,where the updated set of one or more packets excludes successfullydecoded packets included in each of the subsets, and transmit theupdated set of one or more network encoded packets to the plurality ofUEs.

Another apparatus for wireless communication at a network node isdescribed. The apparatus may include means for transmitting, to aplurality of UEs, a set of one or more network encoded packetsrepresenting a set of one or more packets identified for broadcast tothe plurality of UEs, means for receiving feedback from each of one ormore of the plurality of UEs, the feedback indicating, as respectivesubsets of the set of one or more network encoded packets, a combinationof successfully received network encoded packets of the set of one ormore network encoded packets and successfully decoded packets of the setof one or more packets, means for determining, based on the feedback, asubset of the set of one or more network encoded packets that wassuccessfully decoded for each of the one or more of the plurality of UEsproviding the feedback, means for generating, based on the feedback, anupdated set of one or more network encoded packets based on an updatedset of one or more packets, where the updated set of one or more packetsexcludes successfully decoded packets included in each of the subsets,and means for transmitting the updated set of one or more networkencoded packets to the plurality of UEs.

A non-transitory computer-readable medium storing code for wirelesscommunication at a network node is described. The code may includeinstructions executable by a processor to transmit, to a plurality ofUEs, a set of one or more network encoded packets representing a set ofone or more packets identified for broadcast to the plurality of UEs,receive feedback from each of one or more of the plurality of UEs, thefeedback indicating, as respective subsets of the set of one or morenetwork encoded packets, a combination of successfully received networkencoded packets of the set of one or more network encoded packets andsuccessfully decoded packets of the set of one or more packets,determine, based on the feedback, a subset of the set of one or morenetwork encoded packets that was successfully decoded for each of theone or more of the plurality of UEs providing the feedback, generate,based on the feedback, an updated set of one or more network encodedpackets based on an updated set of one or more packets, where theupdated set of one or more packets excludes successfully decoded packetsincluded in each of the subsets, and transmit the updated set of one ormore network encoded packets to the plurality of UEs.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, determining the subset of theset of one or more network encoded packets that was successfully decodedmay include operations, features, means, or instructions for determiningwhich of the successfully received network encoded packets weresuccessfully decoded so as to be added to the successfully decodedpackets.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for continuing to updateand transmit the updated set of one or more network encoded packetsbased on additional feedback received from the one or more of theplurality of UEs until the updated set of one or more network encodedpackets may be empty.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, determining the subset of theset of one or more network encoded packets may include operations,features, means, or instructions for determining an intersection thesuccessfully decoded packets associated with each of the subsetsindicated in the feedback to identify the successfully decoded packetscommon to each of the subsets.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining, based onthe feedback indicative of the successfully received network encodedpackets, the successfully decoded network encoded packets, or both asecond subset of the set of one or more network encoded packets that wassuccessfully decoded at any of the one or more of the plurality of UEsproviding the feedback, where the updated set of one or more networkencoded packets further excludes the second subset of the set of one ormore network encoded packets.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, determining the second subsetof the set of one or more network encoded packets may includeoperations, features, means, or instructions for determining a union ofthe successfully decoded packets associated with each of the subsetsindicated in the feedback to identify the second subset of the set ofone or more network encoded packets.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the feedback mayinclude operations, features, means, or instructions for receiving thefeedback via a packet data convergence protocol (PDCP) status report, aRLC status report, or a HARQ message.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the feedback mayinclude operations, features, means, or instructions for receiving thefeedback in a network coding sub-layer, where the feedback indicates adecoding status of each packet of the set of one or more packets.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving a channelstate information message in conjunction with the feedback, anddetermining one or more encoding metrics for transmission of the updatedset of one or more packets based on the channel state informationmessage.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, determining the one or moreencoding metrics may include operations, features, means, orinstructions for determining a modulation and coding scheme, an encodingrate, or both.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the channel stateinformation message may include operations, features, means, orinstructions for receiving the channel state information message basedon the feedback indicating a negative acknowledgement for one or more ofthe set of one or more network encoded packets.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting, to one ormore of the plurality of UEs, an indication of one or more networkcoding parameters, where at least the updated set of one or more networkencoded packets may be transmitted to the plurality of UEs in accordancewith the one or more network coding parameters.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the indicationof the one or more network coding parameters may include operations,features, means, or instructions for transmitting an indication of anetwork coding algorithm, a network encoding function, a networkencoding matrix, a number of decoding iterations, or any combinationthereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the indicationof the one or more network coding parameters may include operations,features, means, or instructions for transmitting the one or morenetwork coding parameters using medium access control-control element(MAC-CE) signaling, downlink control information signaling, radioresource control signaling, or any combination thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the indicationof the one or more network coding parameters may include operations,features, means, or instructions for transmitting an indication toswitch from one or more prior network coding parameters to the one ormore network coding parameters.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving, from the oneor more of the plurality of UEs, a request for the one or more networkcoding parameters, where the indication of the one or more networkcoding parameters may be transmitted based on receiving the request.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, receiving the request mayinclude operations, features, means, or instructions for receiving, therequest using medium access control-control element (MAC-CE) signalingor uplink control information signaling.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the updated setof one or more network encoded packets may include operations, features,means, or instructions for transmitting the updated set of one or morenetwork encoded packets via broadcast signaling based on a number of theplurality of UEs that may have failed to decode each packet of the setof one or more network encoded packets being above a threshold amount.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, transmitting the updated setof one or more network encoded packets may include operations, features,means, or instructions for transmitting the updated set of one or morenetwork encoded packets via unicast signaling based on a number of theplurality of UEs that may have failed to decode each packet of the setof one or more network encoded packets being below a threshold amount.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for identifying the set ofone or more packets from a packet pool scheduled for broadcast to theplurality of UEs.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for identifying one or moreadditional packets for broadcast to the plurality of UEs based on theone or more additional packets being added to the packet pool.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for encoding the set of oneor more network encoded packets according to a Luby transform (LT) code,where each network encoded packet of the set of one or more networkencoded packets may be constructed from one or more packets of the setof one or more packets identified for broadcast to the plurality of UEsaccording to a distribution.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the distribution includes anideal soliton distribution, a robust soliton distribution, or anycombination thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 through 3 illustrate examples of wireless communications systemsthat support feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure.

FIGS. 4 through 6 illustrate examples of process flows that supportfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

FIGS. 7 and 8 show block diagrams of devices that support feedback-basedbroadcasting of network coded packets with sidelink in accordance withaspects of the present disclosure.

FIG. 9 shows a block diagram of a communication manager that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

FIG. 10 shows a diagram of a system including a device that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

FIGS. 11 and 12 show block diagrams of devices that supportfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

FIG. 13 shows a block diagram of a communication manager that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

FIG. 14 shows a diagram of a system including a device that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

FIGS. 15 through 18 show flowcharts illustrating methods that supportfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure.

DETAILED DESCRIPTION

Wireless communications systems may support broadcasting of networkcoded packets to receiving devices. The transmitter (e.g., a networknode, base station, etc.) may broadcast multiple packets to multiplereceivers (e.g., each user equipment (UE) of a set of UEs).Additionally, receivers may broadcast packets directly to one another insidelink communication channels without transmitting through a basestation or through a relay point. Sidelink communication may be anexample of device-to-device (D2D) communication, vehicle-to-everything(V2X) communication, or another example of sidelink communication in awireless communications system. The broadcasting may be repeated blindlywithout the transmitters identifying or determining of network codedpackets that have been decoded by the receivers. That is, if thebroadcasting system does not utilize feedback associated with packets,the transmitter may continue to transmit packets blindly without anyindication of packets that have been decoded by the UEs. Thus, thetransmitter may rebroadcast packets in a wasteful manner, since somepackets may have been decoded by each receiver. Thus, the lack offeedback may result in waste, duplication of packets, and decreasedefficiency.

Techniques described herein may leverage feedback for broadcastedpackets to determine which packets of a set to retransmit. Thetransmitter may identify a set of packets for broadcast to a set of UEsand transmit a set of network encoded packets based on the set ofpackets. In some examples, the transmitter may encode the set of networkencoded packets according to a Luby transform (LT) code, where eachnetwork encoded packet of the set of network encoded packets may beconstructed from one or more packets according to a distribution (e.g.,an ideal soliton distribution, a robust soliton distribution, amongother examples).

The UEs may each rebroadcast successfully received network encodedpackets via sidelink communications. When each UE has received a firstround of network encoded packets from both the transmitter as wells asfrom other UEs, each UE may determine to transmit feedback to theoriginal transmitter. Each UE may transmit feedback that indicatessuccessfully received packets at the UE or that indicates successfullydecoded packets at the UE.

The feedback may be received via one or more hybrid automatic repeatrequest (HARD) messages, using a packet data convergence protocol (PDCP)status report, or a radio link control (RLC) status report. Further, thetransmitter may configure the UEs with network encoding parameters, suchas a network coding algorithm, a network coding function, a networkencoding matrix, a number of decoding iterations, or a combinationthereof. Thus, the transmitter and the UEs may be synchronized such thatthe transmitter may encode the packets and the UEs may decode thepackets. In some examples, the transmitter may adjust encoding metrics,such as a modulation and coding scheme (MCS) or encoding rate, based onthe feedback such that the UEs may have a higher probability ofsuccessfully decoding packets. These and other implementations arefurther described with respect to the figures herein.

The transmitter may generate an updated set of network encoded packetsbased on the feedback received from one or more of the UEs. The updatedset of network encoded packets may be determined based on thetransmitter inferring (e.g., determining), from the feedback, whichpackets have been commonly decoded at the one or more of the UEs or aunion of the packets decoded at the one or more of the UEs. Thetransmitter may continue to update and transmit the updated set ofnetwork encoded packets based on feedback until the transmitterdetermines that each UE has recovered the set of packets.

Particular aspects of the subject matter described herein may beimplemented to realize one or more advantages. The described techniquesmay support improvements in the packet broadcasting framework,decreasing signaling overhead, and improving reliability, among otheradvantages. As such, supported techniques may include improved networkoperations and, in some examples, may promote network efficiencies,among other benefits.

Aspects of the disclosure are initially described in the context ofwireless communications systems. Additional aspects of the disclosureare described in the context of process flows. Aspects of the disclosureare further illustrated by and described with reference to apparatusdiagrams, system diagrams, and flowcharts that relate to feedback-basedbroadcasting of network coded packets with sidelink.

FIG. 1 illustrates an example of a wireless communications system 100that supports feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure. Thewireless communications system 100 may include one or more base stations105, one or more UEs 115, and a core network 130. In some examples, thewireless communications system 100 may be a Long Term Evolution (LTE)network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a NewRadio (NR) network. In some examples, the wireless communications system100 may support enhanced broadband communications, ultra-reliable (e.g.,mission critical) communications, low latency communications,communications with low-cost and low-complexity devices, or anycombination thereof.

The base stations 105 may be dispersed throughout a geographic area toform the wireless communications system 100 and may be devices indifferent forms or having different capabilities. The base stations 105and the UEs 115 may wirelessly communicate via one or more communicationlinks 125. Each base station 105 may provide a coverage area 110 overwhich the UEs 115 and the base station 105 may establish one or morecommunication links 125. The coverage area 110 may be an example of ageographic area over which a base station 105 and a UE 115 may supportthe communication of signals according to one or more radio accesstechnologies.

The UEs 115 may be dispersed throughout a coverage area 110 of thewireless communications system 100, and each UE 115 may be stationary,or mobile, or both at different times. The UEs 115 may be devices indifferent forms or having different capabilities. Some example UEs 115are illustrated in FIG. 1 . The UEs 115 described herein may be able tocommunicate with various types of devices, such as other UEs 115, thebase stations 105, or network equipment (e.g., core network nodes, relaydevices, integrated access and backhaul (IAB) nodes, or other networkequipment), as shown in FIG. 1 .

The base stations 105 may communicate with the core network 130, or withone another, or both. For example, the base stations 105 may interfacewith the core network 130 through one or more backhaul links 120 (e.g.,via an S1, N2, N3, or other interface). The base stations 105 maycommunicate with one another over the backhaul links 120 (e.g., via anX2, Xn, or other interface) either directly (e.g., directly between basestations 105), or indirectly (e.g., via core network 130), or both. Insome examples, the backhaul links 120 may be or include one or morewireless links.

One or more of the base stations 105 described herein may include or maybe referred to by a person having ordinary skill in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or agiga-NodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, awireless device, a remote device, a handheld device, or a subscriberdevice, or some other suitable terminology, where the “device” may alsobe referred to as a unit, a station, a terminal, or a client, amongother examples. A UE 115 may also include or may be referred to as apersonal electronic device such as a cellular phone, a personal digitalassistant (PDA), a tablet computer, a laptop computer, or a personalcomputer. In some examples, a UE 115 may include or be referred to as awireless local loop (WLL) station, an Internet of Things (IoT) device,an Internet of Everything (IoE) device, or a machine type communications(MTC) device, among other examples, which may be implemented in variousobjects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with varioustypes of devices, such as other UEs 115 that may sometimes act as relaysas well as the base stations 105 and the network equipment includingmacro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations,among other examples, as shown in FIG. 1 .

The UEs 115 and the base stations 105 may wirelessly communicate withone another via one or more communication links 125 over one or morecarriers. The term “carrier” may refer to a set of radio frequencyspectrum resources having a defined physical layer structure forsupporting the communication links 125. For example, a carrier used fora communication link 125 may include a portion of a radio frequencyspectrum band (e.g., a bandwidth part (BWP)) that is operated accordingto one or more physical layer channels for a given radio accesstechnology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layerchannel may carry acquisition signaling (e.g., synchronization signals,system information), control signaling that coordinates operation forthe carrier, user data, or other signaling. The wireless communicationssystem 100 may support communication with a UE 115 using carrieraggregation or multi-carrier operation. A UE 115 may be configured withmultiple downlink component carriers and one or more uplink componentcarriers according to a carrier aggregation configuration. Carrieraggregation may be used with both frequency division duplexing (FDD) andtime division duplexing (TDD) component carriers.

Signal waveforms transmitted over a carrier may be made up of multiplesubcarriers (e.g., using multi-carrier modulation (MCM) techniques suchas orthogonal frequency division multiplexing (OFDM) or discrete Fouriertransform spread OFDM (DFT-S-OFDM)). In a system employing MCMtechniques, a resource element may consist of one symbol period (e.g., aduration of one modulation symbol) and one subcarrier, where the symbolperiod and subcarrier spacing are inversely related. The number of bitscarried by each resource element may depend on the modulation scheme(e.g., the order of the modulation scheme, the coding rate of themodulation scheme, or both). Thus, the more resource elements that a UE115 receives and the higher the order of the modulation scheme, thehigher the data rate may be for the UE 115. A wireless communicationsresource may refer to a combination of a radio frequency spectrumresource, a time resource, and a spatial resource (e.g., spatial layersor beams), and the use of multiple spatial layers may further increasethe data rate or data integrity for communications with a UE 115.

The time intervals for the base stations 105 or the UEs 115 may beexpressed in multiples of a basic time unit which may, for example,refer to a sampling period of T_(s)=1/(Δf_(max)·N_(f)) seconds, whereΔf_(max) may represent the maximum supported subcarrier spacing, andN_(f) may represent the maximum supported discrete Fourier transform(DFT) size. Time intervals of a communications resource may be organizedaccording to radio frames each having a specified duration (e.g., 10milliseconds (ms)). Each radio frame may be identified by a system framenumber (SFN) (e.g., ranging from 0 to 1023).

Each frame may include multiple consecutively numbered subframes orslots, and each subframe or slot may have the same duration. In someexamples, a frame may be divided (e.g., in the time domain) intosubframes, and each subframe may be further divided into a number ofslots. Alternatively, each frame may include a variable number of slots,and the number of slots may depend on subcarrier spacing. Each slot mayinclude a number of symbol periods (e.g., depending on the length of thecyclic prefix prepended to each symbol period). In some wirelesscommunications systems 100, a slot may further be divided into multiplemini-slots containing one or more symbols. Excluding the cyclic prefix,each symbol period may contain one or more (e.g., N_(f)) samplingperiods. The duration of a symbol period may depend on the subcarrierspacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallestscheduling unit (e.g., in the time domain) of the wirelesscommunications system 100 and may be referred to as a transmission timeinterval (TTI). In some examples, the TTI duration (e.g., the number ofsymbol periods in a TTI) may be variable. Additionally or alternatively,the smallest scheduling unit of the wireless communications system 100may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using one or more oftime division multiplexing (TDM) techniques, frequency divisionmultiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A controlregion (e.g., a control resource set (CORESET)) for a physical controlchannel may be defined by a number of symbol periods and may extendacross the system bandwidth or a subset of the system bandwidth of thecarrier. One or more control regions (e.g., CORESETs) may be configuredfor a set of the UEs 115. For example, one or more of the UEs 115 maymonitor or search control regions for control information according toone or more search space sets, and each search space set may include oneor multiple control channel candidates in one or more aggregation levelsarranged in a cascaded manner. An aggregation level for a controlchannel candidate may refer to a number of control channel resources(e.g., control channel elements (CCEs)) associated with encodedinformation for a control information format having a given payloadsize. Search space sets may include common search space sets configuredfor sending control information to multiple UEs 115 and UE-specificsearch space sets for sending control information to a specific UE 115.

In some examples, a base station 105 may be movable and thereforeprovide communication coverage for a moving geographic coverage area110. In some examples, different geographic coverage areas 110associated with different technologies may overlap, but the differentgeographic coverage areas 110 may be supported by the same base station105. In other examples, the overlapping geographic coverage areas 110associated with different technologies may be supported by differentbase stations 105. The wireless communications system 100 may include,for example, a heterogeneous network in which different types of thebase stations 105 provide coverage for various geographic coverage areas110 using the same or different radio access technologies.

The wireless communications system 100 may support synchronous orasynchronous operation. For synchronous operation, the base stations 105may have similar frame timings, and transmissions from different basestations 105 may be approximately aligned in time. For asynchronousoperation, the base stations 105 may have different frame timings, andtransmissions from different base stations 105 may, in some examples,not be aligned in time. The techniques described herein may be used foreither synchronous or asynchronous operations.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay such information to acentral server or application program that makes use of the informationor presents the information to humans interacting with the applicationprogram. Some UEs 115 may be designed to collect information or enableautomated behavior of machines or other devices. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples,half-duplex communications may be performed at a reduced peak rate.Other power conservation techniques for the UEs 115 include entering apower saving deep sleep mode when not engaging in active communications,operating over a limited bandwidth (e.g., according to narrowbandcommunications), or a combination of these techniques. For example, someUEs 115 may be configured for operation using a narrowband protocol typethat is associated with a defined portion or range (e.g., set ofsubcarriers or resource blocks (RBs)) within a carrier, within aguard-band of a carrier, or outside of a carrier.

The wireless communications system 100 may be configured to supportultra-reliable communications or low-latency communications, or variouscombinations thereof. For example, the wireless communications system100 may be configured to support ultra-reliable low-latencycommunications (URLLC) or mission critical communications. The UEs 115may be designed to support ultra-reliable, low-latency, or criticalfunctions (e.g., mission critical functions). Ultra-reliablecommunications may include private communication or group communicationand may be supported by one or more mission critical services such asmission critical push-to-talk (MCPTT), mission critical video (MCVideo),or mission critical data (MCData). Support for mission criticalfunctions may include prioritization of services, and mission criticalservices may be used for public safety or general commercialapplications. The terms ultra-reliable, low-latency, mission critical,and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly withother UEs 115 over a device-to-device (D2D) communication link 135(e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115utilizing D2D communications may be within the geographic coverage area110 of a base station 105. Other UEs 115 in such a group may be outsidethe geographic coverage area 110 of a base station 105 or be otherwiseunable to receive transmissions from a base station 105. In someexamples, groups of the UEs 115 communicating via D2D communications mayutilize a one-to-many (1:M) system in which each UE 115 transmits toevery other UE 115 in the group. In some examples, a base station 105facilitates the scheduling of resources for D2D communications. In othercases, D2D communications are carried out between the UEs 115 withoutthe involvement of a base station 105.

In some systems, the D2D communication link 135 may be an example of acommunication channel, such as a sidelink communication channel, betweenvehicles (e.g., UEs 115). In some examples, vehicles may communicateusing vehicle-to-everything (V2X) communications, vehicle-to-vehicle(V2V) communications, or some combination of these. A vehicle may signalinformation related to traffic conditions, signal scheduling, weather,safety, emergencies, or any other information relevant to a V2X system.In some examples, vehicles in a V2X system may communicate with roadsideinfrastructure, such as roadside units, or with the network via one ormore network nodes (e.g., base stations 105) using vehicle-to-network(V2N) communications, or with both.

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC) or 5G core (5GC), which may include at leastone control plane entity that manages access and mobility (e.g., amobility management entity (MME), an access and mobility managementfunction (AMF)) and at least one user plane entity that routes packetsor interconnects to external networks (e.g., a serving gateway (S-GW), aPacket Data Network (PDN) gateway (P-GW), or a user plane function(UPF)). The control plane entity may manage non-access stratum (NAS)functions such as mobility, authentication, and bearer management forthe UEs 115 served by the base stations 105 associated with the corenetwork 130. User IP packets may be transferred through the user planeentity, which may provide IP address allocation as well as otherfunctions. The user plane entity may be connected to the networkoperators IP services 150. The operators IP services 150 may includeaccess to the Internet, Intranet(s), an IP Multimedia Subsystem (IMS),or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may includesubcomponents such as an access network entity 140, which may be anexample of an access node controller (ANC). Each access network entity140 may communicate with the UEs 115 through one or more other accessnetwork transmission entities 145, which may be referred to as radioheads, smart radio heads, or transmission/reception points (TRPs). Eachaccess network transmission entity 145 may include one or more antennapanels. In some configurations, various functions of each access networkentity 140 or base station 105 may be distributed across various networkdevices (e.g., radio heads and ANCs) or consolidated into a singlenetwork device (e.g., a base station 105).

The wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 megahertz (MHz) to 300gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known asthe ultra-high frequency (UHF) region or decimeter band because thewavelengths range from approximately one decimeter to one meter inlength. The UHF waves may be blocked or redirected by buildings andenvironmental features, but the waves may penetrate structuressufficiently for a macro cell to provide service to the UEs 115 locatedindoors. The transmission of UHF waves may be associated with smallerantennas and shorter ranges (e.g., less than 100 kilometers) compared totransmission using the smaller frequencies and longer waves of the highfrequency (HF) or very high frequency (VHF) portion of the spectrumbelow 300 MHz.

The wireless communications system 100 may utilize both licensed andunlicensed radio frequency spectrum bands. For example, the wirelesscommunications system 100 may employ License Assisted Access (LAA),LTE-Unlicensed (LTE-U) radio access technology, or NR technology in anunlicensed band such as the 5 GHz industrial, scientific, and medical(ISM) band. When operating in unlicensed radio frequency spectrum bands,devices such as the base stations 105 and the UEs 115 may employ carriersensing for collision detection and avoidance. In some examples,operations in unlicensed bands may be based on a carrier aggregationconfiguration in conjunction with component carriers operating in alicensed band (e.g., LAA). Operations in unlicensed spectrum may includedownlink transmissions, uplink transmissions, P2P transmissions, or D2Dtransmissions, among other examples.

A base station 105 or a UE 115 may be equipped with multiple antennas,which may be used to employ techniques such as transmit diversity,receive diversity, multiple-input multiple-output (MIMO) communications,or beamforming. The antennas of a base station 105 or a UE 115 may belocated within one or more antenna arrays or antenna panels, which maysupport MIMO operations or transmit or receive beamforming. For example,one or more base station antennas or antenna arrays may be co-located atan antenna assembly, such as an antenna tower. In some examples,antennas or antenna arrays associated with a base station 105 may belocated in diverse geographic locations. A base station 105 may have anantenna array with a number of rows and columns of antenna ports thatthe base station 105 may use to support beamforming of communicationswith a UE 115. Likewise, a UE 115 may have one or more antenna arraysthat may support various MIMO or beamforming operations. Additionally oralternatively, an antenna panel may support radio frequency beamformingfor a signal transmitted via an antenna port.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105, a UE 115) to shape or steeran antenna beam (e.g., a transmit beam, a receive beam) along a spatialpath between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that some signals propagatingat particular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying amplitude offsets, phase offsets, or both to signals carriedvia the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

The wireless communications system 100 may be a packet-based networkthat operates according to a layered protocol stack. In the user plane,communications at the bearer or Packet Data Convergence Protocol (PDCP)layer may be IP-based. A Radio Link Control (RLC) layer may performpacket segmentation and reassembly to communicate over logical channels.A Medium Access Control (MAC) layer may perform priority handling andmultiplexing of logical channels into transport channels. The MAC layermay also use error detection techniques, error correction techniques, orboth to support retransmissions at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or a corenetwork 130 supporting radio bearers for user plane data. At thephysical layer, transport channels may be mapped to physical channels.

The UEs 115 and the base stations 105 may support retransmissions ofdata to increase the likelihood that data is received successfully. HARQfeedback is one technique for increasing the likelihood that data isreceived correctly over a communication link 125. HARQ may include acombination of error detection (e.g., using a cyclic redundancy check(CRC)), forward error correction (FEC), and retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., low signal-to-noise conditions).In some examples, a device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Some wireless communications systems 100 may support broadcastingpackets to a plurality of UEs 115. The packets may be broadcast by anetwork node, which may be an example of a base station 105, UE 115, orthe like. The transmitter may broadcast multiple packets to multiplereceivers (e.g., UEs 115). The broadcasting may be repeated blindlywithout the transmitter knowing whether packets have been received ordecoded by the receivers. That is, if the wireless communications system100 does not utilize feedback associated with the packets, thetransmitter may continue to transmit packets blindly without anyindication of packets that have actually been decoded by the UEs 115.Thus, the transmitter may rebroadcast packets in a wasteful manner,since some packets may have been decoded by all UEs 115. Thus, the lackof feedback may result in waste, unnecessary duplication of packets, andlow efficiency.

Techniques described herein support a packet broadcasting design thatuses feedback received from the UEs 115. The transmitter (e.g., basestation 105) may identify a set of packets for broadcasting to aplurality of UEs 115 and transmit a set of network encoded packets basedon the set of packets. The UEs 115 may each rebroadcast successfullyreceived network encoded packets via sidelink communications. When eachUE 115 has received a first round of network encoded packets from boththe transmitter as well as from other UEs 115, each UE 115 may report tothe original transmitter via feedback. The feedback may indicatesuccessfully received network encoded packets at each UE 115 or mayindicate successfully decoded packets at each UE 115.

The transmitter may generate an updated set of network encoded packetsbased on the feedback received from one or more of the UEs 115. Theupdated set of network encoded packets may be determined based on thetransmitter inferring (e.g., determining), from the feedback, whichpackets have been commonly decoded at the one or more of the UEs 115 ora union of the packets decoded at the one or more of the UEs 115. Thetransmitter may continue to update and transmit the updated set ofnetwork encoded packets based on feedback until the transmitterdetermines that each UE 115 has recovered the set of packets.

Using this technique, the transmitter may reduce waste and duplicationof packets by retransmitting packets that have not been decoded by theUEs 115. This may result in increased efficiencies in the wirelesscommunications system 100, such as a broadcasting system.

Different types of feedback may support these techniques. For example,the transmitter (e.g., base station 105) may use HARQ messages receivedfrom the UEs 115 to update the sets of packets. The HARQ message mayindicate an acknowledgement (ACK) or negative-acknowledgement (NACK) forone or more packets. Thus, based on the ACKs and NAKs, the transmittermay determine which packets were successfully received by which UEs 115.In some examples, the feedback is received via one or more PDCP statusreports, one or more RLC status reports, or the like. Further to supportthese techniques, the transmitter may configure the UEs 115 with networkcoding parameters, which the UEs 115 may use to decode the packets. Thetransmitter may update the various encoding metrics during thebroadcasting to increase the likelihood that the UEs 115 are able todecode the packets. For example, the transmitter may receive a channelstate information (CSI) report based on receiving a NACK for one or morepackets and update the modulation and coding scheme or encoding ratebased on the CSI report.

FIG. 2 illustrates an example of a wireless communications system 200that supports feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure. In someexamples, the wireless communications system 200 may implement aspectsof the wireless communications system 100. For example, the wirelesscommunications system 200 may include a network entity 205 and UEs 215,which may be examples of the corresponding devices described withreference to FIG. 1 . The wireless communications system 200 mayillustrate an example of a packet broadcasting system. The networkentity 205 may be an example of a base station 105 described withreference to FIG. 1 , a network node, a transmitter, or the like. TheUEs 215 may an example of a UE 115 as described with reference to FIG. 1. The wireless communications system 200 may include features forimproved packet transmission operations, among other benefits.

The UEs 215 may transmit and receive communications as scheduled by thenetwork entity 205. For example, the UEs 215 may communicate with thenetwork entity via direct links 220 (e.g., communication links 125described with reference to FIG. 1 ). Additionally, the UEs 215 maycommunicate directly with one another via sidelink connections 225without transmitting through the network entity 205. For instance, UE215-a may communicate with UE 215-c via sidelink connection 225-a; UE215-a may communicate with UE 215-b via sidelink connection 225-b; andUE 215-b may communicate with UE 215-c via sidelink connection 225-c.The sidelink connections 225 may illustrate examples of D2Dcommunication, V2X communication, or another example of sidelinkcommunication in the wireless communications system 200.

In some cases, the wireless communications system 200 may supportbroadcasting packets by the network entity 205 to the UEs 215 via thedirect links 220. The network entity 205 may repeat the broadcastingblindly without knowing whether the packets were received or decoded bythe UEs 215. That is, if the wireless communications system 200 does notutilize feedback associated with the packets, the network entity 205 maycontinue to transmit packets blindly without any indication of packetsthat have actually been received or decoded by the UEs 215. Thus, thenetwork entity 205 may rebroadcast packets in a wasteful manner, sincesome packets may have been received or decoded by all UEs 215. Thus, thelack of feedback may result in waste, unnecessary duplication ofpackets, and low efficiency.

Techniques described herein support a packet broadcasting design thatuses feedback received from the UEs 215. The network entity 205 mayidentify a set of packets for broadcasting to the UEs 215 and transmit aset of network encoded packets based on the set of packets via thedirect links 220. The UEs 215 may each rebroadcast successfully receivednetwork encoded packets via the sidelink connections 225. When each UE215 has received a first round of network encoded packets from both thenetwork entity 205 as well as from other UEs 215, each UE 215 may reportto the network entity 205 via feedback on a direct link 220. Thefeedback may indicate successfully received network encoded packets orsuccessfully decoded packets at each UE 215.

Each of the receiving UEs 215 may provide feedback associated withreceiving the broadcasted network encoded packets. For example, feedbackreceived from a particular UE 215 may indicate a subset of successfullyreceived network encoded packets of the set of network encoded packetsor may indicate a subset of successfully decoded packets of the set ofpackets used to generate the set of network encoded packets. The networkentity 205 may generate an updated set of network encoded packets basedon the feedback received from one or more of the UEs 215. The updatedset of network encoded packets may be determined based on thetransmitter inferring (e.g., determining), from the feedback, whichpackets have been commonly decoded at the one or more of the UEs or aunion of the packets decoded at the one or more of the UEs. The networkentity 205 may continue to update and transmit the updated set ofnetwork encoded packets based on feedback until the network entity 205determines that each UE 215 of the UEs 215 has recovered the set ofpackets.

Using this technique, the network entity 205 may reduce waste andduplication of packets by retransmitting packets that have not beenreceived by the UEs 215. This may result in increased efficiencies inthe wireless communications system 200.

FIG. 3 illustrates an example of a wireless communications system 300that supports broadcasting packets using network coding via sidelinkwith feedback in accordance with aspects of the present disclosure. Insome examples, the wireless communications system 300 may implementaspects of wireless communications systems 100 and 200. For example, thewireless communications system 300 may include a network entity 305 andUEs 315, which may be examples of the corresponding devices describedwith reference to FIGS. 1 and 2 . The wireless communications system 300may illustrate an example of a packet broadcasting system. The wirelesscommunications system 300 may include features for improved packettransmission operations, among other benefits.

The network entity 305 may configure the UEs 315 with network codingparameters, such as an encoding matrix, encoding/decoding function, etc.These parameters may be used by the UEs 315 to decode the packets. Forexample, a row of the encoding matrix may indicate an ordering orgrouping of network encoded packets that are transmitted to the UEs 315.The network coding parameters may be signaling using medium accesscontrol-control element (MAC-CE) signaling, downlink control information(DCI), or RRC signaling. In some cases, multiple sets of network codingparameters may be signaled.

The network entity 305 may identify a set of packets for transmission tothe UEs 315. In one example, the network entity 305 identifies the setof packets from a packet pool, which may be a set of packets scheduledfor broadcasting. In some examples, the broadcasting may support acontent streaming service and the packets may correspond to the streamedcontent. From the set of packets, the network entity 305 may encode(e.g., using LT coding) and transmit a set of network encoded packets320-a to the UEs 315 in a broadcast manner. Each of the UEs 315 mayreceive one or more encoded packets of the set of network encodedpackets 320-a. The UEs 315 may each rebroadcast successfully receivednetwork encoded packets 320-a via sidelink connections 330. Forinstance, UE 315-a may rebroadcast the decoded packets via one or moreof sidelink connections 330-a and 330-b; UE 315-b may rebroadcast thedecoded packets via one or more of sidelink connections 330-b and 330-c;and UE 315-c may rebroadcast the decoded packets via one or more ofsidelink connections 330-a and 330-c.

When each UE 315 has received a first round of network encoded packets320-a from both the network entity 305 as wells as from other UEs 115,each UE 115 may report to the network entity 305 via feedback 325. Thefeedback 325 may indicate a subset of the set of network encoded packets320-a that each UE 315 was able to successfully receive or a subset ofthe set of packets used to generate the set of network encoded packets320-a that each UE 315 was able to successfully decode, either directlyfrom the network entity 305 or via the sidelink connections 330. Forexample, the UE 315-a may transmit feedback 325-a that indicates a firstsubset of the set of packets that the UE 315-a was able to successfullyreceive or decode, while the UE 315-b transmits feedback 325-b thatindicates a second subset of the set of packets that the UE 315-b wasable to successfully receive or decode, and the UE 315-c transmitsfeedback 325-c that indicates a second subset of the set of packets thatthe UE 315-c was able to successfully receive or decode.

Based on the received feedback 325, the network entity 305 may generatean updated set of network encoded packets 320-b. The updated set ofnetwork encoded packets may be determined based on the transmitterinferring (e.g., determining), from the feedback, which packets havebeen commonly decoded at the one or more of the UEs 315 or a union ofthe packets decoded at the one or more of the UEs 315. The updated setof network encoded packets 320-b is transmitted to the UEs 315 and thenetwork entity 305 may continue to update and transmit updated sets ofnetwork encoded packets 320 based on feedback 325 until the networkentity 305 determines that each UE 315 of the UEs 315 has recovered theset of packets.

As described herein, the feedback 325 may be an example of one or HARQmessages. In other cases, the feedback 325 may be an example of a PDCPstatus report or RLC status report. Based on the reports or HARQmessages, the network entity 305 may infer (e.g., determine) the packetreceiving/recovery results. In some examples, the UEs 315 may transmitthe feedback 325 in the network coding sub-layer, and such feedback 325may directly indicate the receiving success/failure corresponding toeach packet. Thus, rather than inferring (e.g., determining) packetdecoding success failure based on HARQ messages (e.g., correlating HARQmessages to packets), the feedback 325 may directly indicate packetreceiving success and/or failure. In some cases, one or more of the UEs315 transmit a CSI report to facilitate MCS selection and/or ratecontrol. Thus, based on received feedback 325 and a CSI report, thenetwork entity 305 may adjust the MCS or encoding rate to increaselikelihood of successful decoding by the UEs 315. In some examples, theCSI report is transmitted when a NACK is transmitted in order to requestthe updated MCS or data encoding rate for better data reception.

As described herein, one or more sets of network coding parameters maybe configured at the UEs 315. If one set of parameters is configured atone or more of the UEs 315 and the network entity 305 determines thatthe transmission is underperforming (e.g., that the feedback 325indicates that a relatively high number of packets are not decoded),then the network entity 305 may transmit a new set of network codingparameters to the UEs 315 (e.g., via MAC-CE or DCI). In other cases, theUE 315 may request an updated set of network coding parameters (e.g.,via MAC-CE or uplink control information (UCI)). In either case, afterthe updated set of parameters is transmitted, subsequent sets of packetsmay be encoded and transmitted according to the updated set ofparameters. If multiple sets of network coding parameters aresynchronized between the network entity 305 and the UEs 315, then thenetwork entity 305 may transmit an instruction to switch between sets ofparameters (e.g., based on underperformance or based on a request from aUE 315 received via MAC-CE or UCI) via MAC-CE or DCI.

In some examples, the network entity 305 may encode the network encodedpackets 320 using an LT coding process. In the LT coding process, thenetwork entity 305 may map source symbols of the set of packets to a setof encoding symbols. The LT coding process may employ a degreedistribution Ω, where the degree distribution Ω represents a probabilitymass function of a set of degrees d_(i) (e.g., d₁, d₂, d₃, etc.). Theprobability of randomly selecting a degree d_(i) (i.e., a degree withindex i) from the degree distribution may be represented by ρ(i). In theLT coding process, the degree d_(i) of an ith encoding symbol mayrepresent the quantity of source symbols which the network entity 305may combine into the ith encoding symbol. For example, if the selecteddegree for a first encoding symbol is d₁=2, two source symbols may berandomly selected and combined into the first encoding symbol.Similarly, if the selected degree for a second encoding symbol is d₂=1,a single source symbol may be combined into the second encoding symbol.In some examples, the source symbols may be combined into encodingsymbols using a logic operation such as a logic exclusive OR (XOR)operation. In some examples, each encoding symbol may includeinformation identifying the source symbols used to construct theencoding symbol. For example, the encoding symbol may include indices(e.g., s₁, s₂, s₃, s_(K), etc.) associated with the source symbols usedto construct the encoding symbol. The encoding symbols may betransmitted as the set of network encoded packets 320-a from the networkentity 305 to the UEs 315. In some examples, the LT coding process maybe represented by a generator matrix.

In some examples, one or more encoded packets may be lost based on thetransmission environment. A UE 315 may receive a subset of the set ofnetwork encoded packets 320-a (e.g., a quantity N of encoded packets).The UE 315 may decode the received encoding symbols to obtain the sourcesymbols. The UE 315 may begin a decoding process by identifying anencoding symbol with an index t_(J) that is connected to a single sourcesymbol with an index s_(i). The UE 315 may determine the encoding symbolwith index t_(j) is equivalent to the source symbol with index s_(i).The UE 315 may then apply an XOR operation to each other encoding symbolconnected to the source symbol with index s_(i), and remove all edgesconnected to the source symbol with index s_(i). The UE 315 may repeatthis process until each source symbol is determined from the receivedencoding symbols.

In some examples, the decoding process may fail if there is no encodingsymbol connected to a single source symbol. Accordingly, the degreedistribution D. of the encoding symbols received at the UE 315 may havea direct impact on the probability of successfully decoding sourcesymbols transmitted in encoding symbols. For example, in a first degreedistribution (which may in some examples be referred to as an idealsoliton distribution), the probability ρ(i) of selecting a degree d_(i)(where d_(i) is an integer from 1 to K) may be defined by:

$\begin{matrix}{{\rho(i)} = \left\{ \begin{matrix}{\frac{1}{K},{i = 1}} \\{\frac{1}{i\left( {1 - 1} \right)},{i = 1},2,\ldots,K}\end{matrix} \right.} & (1)\end{matrix}$The first degree distribution may have a mode (e.g., a high probability)at d_(i)=2.

Alternatively, in a second degree distribution (which in some examplesmay be referred to as a robust soliton distribution), the probability ofselecting the degree d_(i) may be represented by μ(i) rather than ρ(i)of the ideal soliton distribution. The probability μ(i) may be definedby:

$\begin{matrix}{{{\mu(i)} = \frac{{\rho(i)} + {\tau(i)}}{{\sum_{j = 1}^{K}{\rho(j)}} + {\tau(j)}}},} & (2)\end{matrix}$where τ(i) is a parameter defined in terms of constants c and

${R = {c\sqrt{K}{\ln\left( \frac{K}{\delta} \right)}}},$as well as a decoding error probability δ. The parameter τ(i) may bedefined for various values of i as:

$\begin{matrix}{{\tau(i)} = \left\{ \begin{matrix}{\frac{R}{iK},{i = 1},2,\ldots,{\frac{K}{R} - 1}} \\{{\frac{R}{K}{\ln\left( \frac{R}{\delta} \right)}},{i = \frac{K}{R}}} \\{0,{{otherwise}.}}\end{matrix} \right.} & (3)\end{matrix}$The robust soliton distribution may have a greater probability that arandom d_(i)=1 than the ideal soliton distribution, which may reduce theprobability of the decoding process failing by increasing theprobability that an encoding symbol is connected to a single sourcesymbol.

The encoding scheme described herein may enable the network entity 305to improve efficiency and reliability of communications with the UEs 315by increasing the probability of successfully decoding source symbolstransmitted in encoding symbols.

FIG. 4 illustrates an example of a process flow 400 that supportsbroadcasting packets using network coding via sidelink with feedback inaccordance with aspects of the present disclosure. In some examples, theprocess flow 400 may implement aspects of wireless communicationssystems 100, 200, and 300. For example, the process flow 400 may includeexample operations associated with one or more of a transmitter 405 or aset of receivers 415, which may be examples of a base station and UEs,respectively, described with reference to FIGS. 1 through 3 . Thereceivers 415 may be receivers 415 of a group of receivers 415 thatincludes m receivers 415. In the following description of the processflow 400, the operations between the transmitter 405 and the receivers415 may be performed in a different order than the example order shown,or the operations performed by the transmitter 405 and the receivers 415may be performed in different orders or at different times. Someoperations may also be omitted from the process flow 400, and otheroperations may be added to the process flow 400. The operationsperformed by the transmitter 405 and the receivers 415 may supportimprovement to the transmitter 405 packet transmission operations and,in some examples, may promote improvements to efficiency and reliabilityfor communications between the transmitter 405 and the receivers 415,among other benefits.

At 420, the transmitter 405 may construct a packet pool S={p1, p2, . . ., pn}. The set of network encoded packets may be encoded using a networkencoding function q=f(S)={q1, q2, . . . , qk} and the set of networkencoded packets q may be transmitted to the receivers 415 (e.g.,receivers 415-a, 415-b and 415-c). In some example, the set of networkencoded packets q may be encoded using an LT code.

At 425, each receiver 415 may broadcast successfully received encodedpackets via sidelink connections with the group of receivers 415. Forexample, the receiver 415-a may successfully receive network encodedpackets q1 and q2 of the set q and broadcast q1 and q2 to the otherreceivers 415. Similarly, the receiver 415-b may successfully receivenetwork encoded packets q2 and q3 and broadcast q2 and q3 to the otherreceivers 415. Likewise, the receiver 415-c may successfully receivenetwork encoded packets q2 and q5 and may broadcast q2 and q5 to theother receivers 415.

At 430, each receiver 415 may gather network encoded packets receivedfrom the direct link and the sidelink connections. For example, thereceiver 415-a may receive the broadcast from the receiver 415-b and maythus have received a first subset of network encoded packets {q1, q2,q3}. Similarly, the receiver 415-b may receive the broadcast fromreceiver 415-c and may thus have received a second subset of networkencoded packets {q2, q3, q5}. Likewise, the receiver 415-c may receivethe broadcast from receiver 415-a and may thus have received a thirdsubset of network encoded packets {q1, q2, q5}.

Additionally, at 430, each receiver 415 may send feedback to thetransmitter 405. In some examples, the feedback may indicate the packetssuccessfully decoded by the receiver 415. For instance, receiver 415-amay decode packets q1, q2, and q3 to successfully determine p1 andreceiver 415-b may decode packets q2, q3, and q5 to successfullydetermine p1 and p3. Receiver 415-a may transmit feedback to transmitter405 indicating decoded packet p1 and receiver 415-b may transmitfeedback to transmitter 405 indicating decoded packets p1 and p3. Insome examples, the feedback may indicate the packets successfullyreceived by the receiver 415. For instance, receiver 415-c may transmitfeedback to transmitter 405 indicating that q1, q2, and q5 weresuccessfully received.

At 435, transmitter 405 may determine a set of commonly decoded packetsM among the receivers 415. For instance, from the feedback received fromreceivers 415-a (e.g., p1) and 415-b (e.g., p1 and p3), transmitter 405may determine that receivers 415-a and 415-b have both obtained decodedpacket p1. Additionally, even though the feedback received from receiver415-c indicates packets successfully received by receiver 415-c (e.g.,q1, q2, and q5), transmitter 405 may determine that these networkencoded packets are decodable to produce p1. As such, transmitter 405may determine that p1 has been decoded at each of the receivers 415 and,thus, M={p1}.

At 440, transmitter 405 may generate newly encoded packets using thepacket pool S and M. For instance, the transmitter 405 may determine aset of network encoded packets according to f(S). The transmitter 405may determine the newly encoded packets according to f(S′)=f(S−M). Inthe present example, M may equal {p1}. As such, if S={p1, p2, . . . ,pn}, then S′ may equal {p2, . . . , pn} and the transmitter 405 maygenerate the newly encoded packets according to f(S′).

At 445, transmitter 405 and the receivers 415 may continue to performthe operations described at 425 through 440 until the transmitter 405infers (e.g., determines) all packets of the packet pool S have beensuccessfully recovered by all receivers 415.

FIG. 5 illustrates an example of a process flow 500 that supportsbroadcasting packets using network coding via sidelink with feedback inaccordance with aspects of the present disclosure. In some examples, theprocess flow 500 may implement aspects of wireless communicationssystems 100, 200, and 300. For example, the process flow 500 may includeexample operations associated with one or more of a transmitter 505 or aset of receivers 515, which may be examples of a base station and UEs,respectively, described with reference to FIGS. 1 through 3 . Thereceivers 515 may be receivers 515 of a group of receivers 515 thatincludes m receivers 515. In the following description of the processflow 500, the operations between the transmitter 505 and the receivers515 may be performed in a different order than the example order shown,or the operations performed by the transmitter 505 and the receivers 515may be performed in different orders or at different times. Someoperations may also be omitted from the process flow 500, and otheroperations may be added to the process flow 500. The operationsperformed by the transmitter 505 and the receivers 515 may supportimprovement to the transmitter 505 packet transmission operations and,in some examples, may promote improvements to efficiency and reliabilityfor communications between the transmitter 505 and the receivers 515,among other benefits.

At 520, the transmitter 505 may construct a packet pool S={p1, p2, . . ., pn}. The set of network encoded packets may be encoded using a networkencoding function q=f(S)={q1, q2, . . . , qk} and the set of networkencoded packets q may be transmitted to the receivers 515 (e.g.,receivers 515-a, 515-b and 515-c). In some example, the set of networkencoded packets q may be encoded using an LT code.

At 525, each receiver 515 may broadcast successfully received encodedpackets via sidelink connections with the group of receivers 515. Forexample, the receiver 515-a may successfully receive network encodedpackets q1 and q2 of the set q and broadcast q1 and q2 to the otherreceivers 515. Similarly, the receiver 515-b may successfully receivenetwork encoded packets q2 and q3 and broadcast q2 and q3 to the otherreceivers 515. Likewise, the receiver 515-c may successfully receivenetwork encoded packets q2 and q5 and may broadcast q2 and q5 to theother receivers 515.

At 530, each receiver 515 may gather network encoded packets receivedfrom the direct link and the sidelink connections. For example, thereceiver 515-a may receive the broadcast from the receiver 515-b and maythus have received a first subset of network encoded packets {q1, q2,q3}. Similarly, the receiver 515-b may receive the broadcast fromreceiver 515-c and may thus have received a second subset of networkencoded packets {q2, q3, q5}. Likewise, the receiver 515-c may receivethe broadcast from receiver 515-a and may thus have received a thirdsubset of network encoded packets {q1, q2, q5}.

Additionally, at 530, each receiver 515 may send feedback to thetransmitter 505. In some examples, the feedback may indicate the packetssuccessfully decoded by the receiver 515. For instance, receiver 515-amay decode packets q1, q2, and q3 to successfully determine p1 andreceiver 515-b may decode packets q2, q3, and q5 to successfullydetermine p1 and p3. Receiver 515-a may transmit feedback to transmitter505 indicating decoded packet p1 and receiver 515-b may transmitfeedback to transmitter 505 indicating decoded packets p1 and p3. Insome examples, the feedback may indicate the packets successfullyreceived by the receiver 515. For instance, receiver 515-c may transmitfeedback to transmitter 505 indicating that q1, q2, and q5 weresuccessfully received.

At 535, transmitter 505 may determine a union of the decoded packets M1among the receivers 515. For instance, from the feedback received fromreceivers 515-a (e.g., p1) and 515-b (e.g., p1 and p3), transmitter 505may determine that a union of the decoded packets provided by receivers515-a and 515-b is {p1, p3}. Additionally, even though the feedbackreceived from receiver 515-c indicates packets successfully received byreceiver 515-c (e.g., q1, q2, and q5), transmitter 505 may determinethat these network encoded packets are decodable to produce p1. Theunion of the decodable packets at receiver 415-c with the decodedpackets of receivers 515-a and 515-b may be {p1, p3} and thus M1 mayequal {p1, p3}.

At 540, transmitter 505 may generate newly encoded packets using thepacket pool S and M1. For instance, the transmitter 505 may determine aset of network encoded packets according to f(S). The transmitter 505may determine the newly encoded packets according to f(S′)=f(S−M1). Inthe present example, M1 may equal {p1, p3}. As such, if S={p1, p2, p3,p4, . . . , pn}, then S′ may equal {p2, p4 . . . , pn} and thetransmitter 505 may generate the newly encoded packets according tof(S′).

At 545, transmitter 505 and the receivers 515 may continue to performthe operations described at 525 through 540 until S′={ } at 550.

At 550, in some examples, each of the packets in S may have been decodedat each of the receivers 415 considered together. However, there may becases where a receiver 415 of the set of receivers 415 has notsuccessfully decoded one or more of the packets in S, even though thepacket has been successfully decoded by another of the set of receivers415.

In such examples, transmitter 505 may determine M2, where M2 may be theset of commonly decoded packets among the receivers 415. Using S and M2,the transmitter 505 may determine S″=S−M2; may generate newly encodedpackets according to f(S″); and may transmit the newly encoded packetsvia a broadcast transmission. Alternatively, transmitter 505 maytransmit the packets that a receiver 415 has not decoded to the receiverdirectly via a unicast transmission directed to that receiver 415.Whether transmitter 505 transmits via broadcast signaling or unicastsignaling may depend on a number of receivers 415 still missing packets.For instance, if the number of receivers 415 is above a threshold,transmitter 505 may transmit broadcast signaling according to f(S″). Ifthe number of receivers 415 missing packets is below the threshold,transmitter 505 may transmit unicast signaling directed to receivers 415missing the packets.

FIG. 6 illustrates an example of a process flow 600 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. In some examples, theprocess flow 600 may implement aspects of wireless communicationssystems 100, 200, and 300. For example, the process flow 600 may includeexample operations associated with one or more of a network entity 605(e.g., a base station) or a set of UEs 615 (e.g., UEs 615-a and 615-b),which may be examples of the corresponding devices described withreference to FIGS. 1 through 3 . In the following description of theprocess flow 500, the operations between the network entity 605 and theUEs 615 may be performed in a different order than the example ordershown, or the operations performed by the network entity 605 and the UEs615 may be performed in different orders or at different times. Someoperations may also be omitted from the process flow 500, and otheroperations may be added to the process flow 500. The operationsperformed by the network entity 605 and the UEs 615 may supportimprovement to the network entity 605 packet transmission operationsand, in some examples, may promote improvements to efficiency andreliability for communications between the network entity 605 and theUEs 615, among other benefits.

At 620, the network entity 605 may identify a set of packets fortransmission to the UEs 615. In one example, the network entity 605identifies the set of packets from a packet pool, which may be a set ofpackets scheduled for broadcasting. In some examples, the broadcastingmay support a content streaming service and the packets may correspondto the streamed content. From the set of packets, the network entity 605may encode (e.g., using LT coding) a set of network encoded packets.

At 625, the network entity 605 may broadcast the set of network encodedpackets to the UEs 615. Each of the UEs 615 may receive one or morenetwork encoded packets of the set of network encoded packets. Forexample, some network encoded packets may be lost based on atransmission environment. At 630, each UE 615 may broadcast successfullyreceived encoded packets via sidelink connections with the group of UEs615.

At 635, each UE 615 may gather network encoded packets received from thedirect link and the sidelink connections to determine a respectivesubset of successfully received network encoded packets. At 640, the UEs615 may each transmit feedback to the network entity 605 indicating therespective subset of successfully received network encoded packets or arespective subset of successfully decoded packets. As noted herein, thefeedback may be an example of one or more HARQ messages. In other cases,the feedback may be an example of a PDCP status report or RLC statusreport. In some examples, the UEs 615 may transmit the feedback in thenetwork coding sub-layer, and such feedback may directly indicate thereceiving success/failure corresponding to each packet. In some cases,one or more of the UEs 615 may transmit a CSI report to facilitate MCSselection and/or rate control. In some examples, the CSI report istransmitted when a NACK is transmitted in order to request the updatedMCS or data encoding rate for better data reception.

In some examples, the UEs 615 may decode the successfully receivednetwork encoded packets concurrent with transmitting feedback. As notedherein, one or more sets of network coding parameters may be configuredat the UEs 615 (e.g., via MAC-CE or DCI). In some cases, one or more UEs615 may request (e.g., along with transmitting feedback) an updated setof network coding parameters (e.g., via MAC-CE or UCI).

At 645, the network entity 605 may determine a subset of successfullydecoded network encoded packets based on the feedback. In one example,the subset may represent successfully decoded packets included in eachof the subsets (e.g., an intersection of the subsets of decodedpackets). In another example, the subset may represent successfullydecoded packets included in any of the subsets (e.g., a union of thesubsets of decoded packets). At 650, the network entity 605 may generatenewly encoded packets, for example using the packet pool.

At 655, the network entity may transmit an updated set of networkencoded packets based on generating the newly encoded packets. Theupdated set of network encoded packets may not be generated according tothe subset of decoded packets determined based on the feedback (e.g.,the union or the intersection of the subsets indicated in or inferred(e.g., determined) according to the feedback).

At 660, the network entity 605 and the UEs 615 may continue to performthe operations described at 630 through 655 until the network entity 605infers (e.g., determines) all packets of the packet pool have beensuccessfully recovered by all receivers UEs 615 (e.g., based on decodingthe successfully received network encoded packets indicated in thefeedback). In cases where the subset of decoded packets determined bythe network entity 605 is determined according to the union, the networkentity 605 may switch to using the intersection once each packet hasbeen successfully decoded at least receiver UE 115 or may transmitunicast signaling indicating the remaining missing packet to receiverUEs 115 still missing packets. The operations performed by the networkentity 605 and the UEs 615 may support improvements to the networkentity 605 packet transmission operations and, in some examples, maypromote improvements to efficiency and reliability for communicationsbetween the network entity 605 and the UEs 615, among other benefits.

FIG. 7 shows a block diagram 700 of a device 705 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The device 705 may bean example of aspects of a UE 115 as described herein. The device 705may include a receiver 710, a communication manager 715, and atransmitter 720. The device 705 may also include a processor. Each ofthese components may be in communication with one another (e.g., via oneor more buses).

The receiver 710 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related tofeedback-based broadcasting of network coded packets with sidelink,etc.). Information may be passed on to other components of the device705. The receiver 710 may be an example of aspects of the transceiver1015 described with reference to FIG. 10 . The receiver 710 may utilizea single antenna or a set of antennas.

The communication manager 715 may receive, as part of a broadcast from anetwork node, a first subset of one or more network encoded packets;receive, via a plurality of sidelink connections with a correspondingplurality of UEs, a second subset of one or more network encoded packetsforwarded after successful receipt by the plurality of UEs from thenetwork node; decode the first subset of one or more network encodedpackets and the second subset of one or more network encoded packets;and determine, based on the decoding, a set of one or more successfullydecoded packets from the network node. The communication manager 715 maybe an example of aspects of the communication manager 1010 describedherein.

The communication manager 715, or its sub-components, may be implementedin hardware, code (e.g., software or firmware) executed by a processor,or any combination thereof. If implemented in code executed by aprocessor, the functions of the communication manager 715, or itssub-components may be executed by a general-purpose processor, a digitalsignal processor (DSP), an application-specific integrated circuit(ASIC), a field-programmable gate array (FPGA) or other programmablelogic device, discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed in the present disclosure.

The communication manager 715, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationmanager 715, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communication manager 715, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 720 may transmit signals generated by other componentsof the device 705. In some examples, the transmitter 720 may becollocated with a receiver 710 in a transceiver module. For example, thetransmitter 720 may be an example of aspects of the transceiver 1015described with reference to FIG. 10 . The transmitter 720 may utilize asingle antenna or a set of antennas.

By including or configuring the communication manager 715 in accordancewith examples as described herein, the device 705 (e.g., a processorcontrolling or otherwise coupled to the receiver 710, the transmitter720, the communication manager 715, or a combination thereof) maysupport techniques for the device 705 to reduce waste and duplication ofpackets by communicating successfully received and decoded packets withother devices (e.g., other UEs 115) and providing feedback that enablesa base station to retransmit packets that have not been received at thedevice 705 and the other devices (e.g., other UEs 115).

FIG. 8 shows a block diagram 800 of a device 805 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The device 805 may bean example of aspects of a device 705, or a UE 115 as described herein.The device 805 may include a receiver 810, a communication manager 815,and a transmitter 835. The device 805 may also include a processor. Eachof these components may be in communication with one another (e.g., viaone or more buses).

The receiver 810 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related tofeedback-based broadcasting of network coded packets with sidelink,etc.). Information may be passed on to other components of the device805. The receiver 810 may be an example of aspects of the transceiver1015 described with reference to FIG. 10 . The receiver 810 may utilizea single antenna or a set of antennas.

The communication manager 815 may be an example of aspects of thecommunication manager 715 as described herein. The communication manager815 may include a network encoded packet receiver 820, a sidelink packetreceiver 825, and a packet decoder 830. The communication manager 815may be an example of aspects of the communication manager 1010 describedherein.

The network encoded packet receiver 820 may receive, as part of abroadcast from a network node, a first subset of one or more networkencoded packets.

The sidelink packet receiver 825 may receive, via a plurality ofsidelink connections with a corresponding plurality of UEs, a secondsubset of one or more network encoded packets forwarded after successfulreceipt by the plurality of UEs from the network node.

The packet decoder 830 may decode the first subset of one or morenetwork encoded packets and the second subset of one or more networkencoded packets and determine, based on the decoding, a set of one ormore successfully decoded packets from the network node.

The transmitter 835 may transmit signals generated by other componentsof the device 805. In some examples, the transmitter 835 may becollocated with a receiver 810 in a transceiver module. For example, thetransmitter 835 may be an example of aspects of the transceiver 1015described with reference to FIG. 10 . The transmitter 835 may utilize asingle antenna or a set of antennas.

FIG. 9 shows a block diagram 900 of a communication manager 905 thatsupports feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure. Thecommunication manager 905 may be an example of aspects of acommunication manager 715, a communication manager 815, or acommunication manager 1010 described herein. The communication manager905 may include a network encoded packet receiver 910, a sidelink packetreceiver 915, a packet decoder 920, a feedback transmitter 925, asidelink packet transmitter 930, and a network coding parametercomponent 935. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

The network encoded packet receiver 910 may receive, as part of abroadcast from a network node, a first subset of one or more networkencoded packets. In some examples, the network encoded packet receiver910 may receive a third subset of one or more network encoded packetsfrom the network node based on transmitting feedback to the networknode, where the third subset of one or more network encoded packets isdifferent from the first subset of one or more network encoded packetsand the second subset of one or more network encoded packets. In someexamples, the third subset of one or more network encoded packets isprovided via broadcast signaling. In some examples, the third subset ofone or more network encoded packets is provided via unicast signaling.

The sidelink packet receiver 915 may receive, via a plurality ofsidelink connections with a corresponding plurality of UEs, a secondsubset of one or more network encoded packets forwarded after successfulreceipt by the plurality of UEs from the network node.

The packet decoder 920 may decode the first subset of one or morenetwork encoded packets and the second subset of one or more networkencoded packets. In some examples, the packet decoder 920 may determine,based on the decoding, a set of one or more successfully decoded packetsfrom the network node.

The feedback transmitter 925 may transmit feedback to the network node,where the feedback indicates the first and second subsets of networkencoded packets or the set of one or more successfully decoded packets.In some examples, the feedback transmitter 925 may transmit a channelstate information message in conjunction with transmitting feedback tothe network node. In some examples, the feedback transmitter 925 maytransmit feedback to the network node via a packet data convergenceprotocol (PDCP) status report, a RLC status report, or a HARQ message.In some examples, the feedback transmitter 925 may transmit feedback tothe network node in a network coding sub-layer, where the feedbackindicates a decoding status of each packet of the set of one or moresuccessfully decoded packets. In some cases, the feedback includes atleast one negative acknowledgement message, at least one acknowledgementmessage, or both.

The sidelink packet transmitter 930 may transmit the first subset of oneor more network encoded packets to a plurality of UEs via a plurality ofsidelink connections.

The network coding parameter component 935 may receive an indication ofone or more network coding parameters, the one or more network codingparameters including a network coding algorithm, a network encodingfunction, a network encoding matrix, a number of decoding iterations, orany combination thereof. In some examples, the network coding parametercomponent 935 may receive the one or more network coding parametersusing medium access control (MAC) control element signaling, downlinkcontrol information signaling, radio resource control signaling, or anycombination thereof. In some examples, the network coding parametercomponent 935 may receive an indication to switch from one or more priornetwork coding parameters to the one or more network coding parameters.In some examples, the network coding parameter component 935 maytransmit, to the network node, a request for the one or more networkcoding parameters, where the indication of the one or more networkcoding parameters is received based on transmitting the request. In someexamples, the network coding parameter component 935 may transmit therequest using medium access control (MAC) control element signaling oruplink control information signaling.

FIG. 10 shows a diagram of a system 1000 including a device 1005 thatsupports feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure. Thedevice 1005 may be an example of or include the components of device705, device 805, or a UE 115 as described herein. The device 1005 mayinclude components for bi-directional voice and data communicationsincluding components for transmitting and receiving communications,including a communication manager 1010, a transceiver 1015, an antenna1020, memory 1025, and a processor 1035. These components may be inelectronic communication via one or more buses (e.g., bus 1040).

The communication manager 1010 may receive, as part of a broadcast froma network node, a first subset of one or more network encoded packets;receive, via a plurality of sidelink connections with a correspondingplurality of UEs, a second subset of one or more network encoded packetsforwarded after successful receipt by the plurality of UEs from thenetwork node; decode the first subset of one or more network encodedpackets and the second subset of one or more network encoded packets;and determine, based on the decoding, a set of one or more successfullydecoded packets from the network node.

The transceiver 1015 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1015 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1015 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1020.However, in some cases the device may have more than one antenna 1020,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1025 may include random-access memory (RAM) and read-onlymemory (ROM). The memory 1025 may store computer-readable,computer-executable code 1030 including instructions that, whenexecuted, cause the processor to perform various functions describedherein. In some cases, the memory 1025 may contain, among other things,a basic input/output system (BIOS) which may control basic hardware orsoftware operation such as the interaction with peripheral components ordevices.

The code 1030 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1030 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1030 may not be directly executable by theprocessor 1035 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

The processor 1035 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1035 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into the processor 1035. The processor 1035 may beconfigured to execute computer-readable instructions stored in a memory(e.g., the memory 1025) to cause the device 1005 to perform variousfunctions (e.g., functions or tasks supporting feedback-basedbroadcasting of network coded packets with sidelink).

By including or configuring the communication manager 1010 in accordancewith examples as disclosed herein, the device 1005 may supporttechniques for the device 1005 to reduce waste and duplication ofpackets by communicating successfully received and decoded packets withother devices (e.g., other UEs 115) and providing feedback that enablesa base station to retransmit packets that have not been received at thedevice 1005 and the other devices (e.g., other UEs 115).

FIG. 11 shows a block diagram 1100 of a device 1105 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The device 1105 maybe an example of aspects of a base station 105 as described herein. Thedevice 1105 may include a receiver 1110, a communication manager 1115,and a transmitter 1120. The device 1105 may also include a processor.Each of these components may be in communication with one another (e.g.,via one or more buses).

The receiver 1110 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related tofeedback-based broadcasting of network coded packets with sidelink,etc.). Information may be passed on to other components of the device1105. The receiver 1110 may be an example of aspects of the transceiver1420 described with reference to FIG. 14 . The receiver 1110 may utilizea single antenna or a set of antennas.

The communication manager 1115 may transmit, to a plurality of UEs, aset of one or more network encoded packets representing a set of one ormore packets identified for broadcast to the plurality of UEs; receivefeedback from each of one or more of the plurality of UEs, the feedbackindicating, as respective subsets of the set of one or more networkencoded packets, a combination of successfully received network encodedpackets of the set of one or more network encoded packets andsuccessfully decoded packets of the set of one or more packets;determine, based on the feedback, a subset of the set of one or morenetwork encoded packets that was successfully decoded for each of theone or more of the plurality of UEs providing feedback; generate, basedon the feedback, an updated set of one or more network encoded packetsbased on an updated set of one or more packets, where the updated set ofone or more packets excludes successfully decoded packets included ineach of the subsets; and transmit the updated set of one or more networkencoded packets to the plurality of UEs. The communication manager 1115may be an example of aspects of the communication manager 1410 describedherein.

The communication manager 1115, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communication manager 1115, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), a FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described in the present disclosure.

The communication manager 1115, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationmanager 1115, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communication manager 1115, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 1120 may transmit signals generated by other componentsof the device 1105. In some examples, the transmitter 1120 may becollocated with a receiver 1110 in a transceiver module. For example,the transmitter 1120 may be an example of aspects of the transceiver1420 described with reference to FIG. 14 . The transmitter 1120 mayutilize a single antenna or a set of antennas.

By including or configuring the communication manager 1115 in accordancewith examples as described herein, the device 1105 (e.g., a processorcontrolling or otherwise coupled to the receiver 1110, the transmitter1120, the communication manager 1115, or a combination thereof) maysupport techniques for the device 1105 to reduce waste and duplicationof packets by receiving feedback from multiple UEs 115 and excludingsuccessfully decoded packets from a set of packets retransmitted to themultiple UEs 115 in response to the feedback.

FIG. 12 shows a block diagram 1200 of a device 1205 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The device 1205 maybe an example of aspects of a device 1105, or a base station 105 asdescribed herein. The device 1205 may include a receiver 1210, acommunication manager 1215, and a transmitter 1240. The device 1205 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 1210 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related tofeedback-based broadcasting of network coded packets with sidelink,etc.). Information may be passed on to other components of the device1205. The receiver 1210 may be an example of aspects of the transceiver1420 described with reference to FIG. 14 . The receiver 1210 may utilizea single antenna or a set of antennas.

The communication manager 1215 may be an example of aspects of thecommunication manager 1115 as described herein. The communicationmanager 1215 may include a network encoded packet transmitter 1220, afeedback receiver 1225, a decoding determination component 1230, and anetwork encoded packet generator 1235. The communication manager 1215may be an example of aspects of the communication manager 1410 describedherein.

The network encoded packet transmitter 1220 may transmit, to a pluralityof UEs, a set of one or more network encoded packets representing a setof one or more packets identified for broadcast to the plurality of UEsand transmit the updated set of one or more network encoded packets tothe plurality of UEs.

The network encoded packet generator 1235 may generate, based on thefeedback, an updated set of one or more network encoded packets based onan updated set of one or more packets, where the updated set of one ormore packets excludes successfully decoded packets included in each ofthe subsets.

The decoding determination component 1230 may determine, based on thefeedback, a subset of the set of one or more network encoded packetsthat was successfully decoded for each of the one or more of theplurality of UEs providing feedback.

The feedback receiver 1225 may receive feedback from each of one or moreof the plurality of UEs, the feedback indicating, as respective subsetsof the set of one or more network encoded packets, a combination ofsuccessfully received network encoded packets of the set of one or morenetwork encoded packets and successfully decoded packets of the set ofone or more packets.

The transmitter 1240 may transmit signals generated by other componentsof the device 1205. In some examples, the transmitter 1240 may becollocated with a receiver 1210 in a transceiver module. For example,the transmitter 1240 may be an example of aspects of the transceiver1420 described with reference to FIG. 14 . The transmitter 1240 mayutilize a single antenna or a set of antennas.

FIG. 13 shows a block diagram 1300 of a communication manager 1305 thatsupports feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure. Thecommunication manager 1305 may be an example of aspects of acommunication manager 1115, a communication manager 1215, or acommunication manager 1410 described herein. The communication manager1305 may include a network encoded packet transmitter 1310, a feedbackreceiver 1315, a decoding determination component 1320, a networkencoded packet generator 1325, an encoding metric determinationcomponent 1330, a network coding parameter component 1335, a packetidentification component 1340, and an encoding component 1345. Each ofthese modules may communicate, directly or indirectly, with one another(e.g., via one or more buses).

The network encoded packet transmitter 1310 may transmit, to a pluralityof UEs, a set of one or more network encoded packets representing a setof one or more packets identified for broadcast to the plurality of UEs.In some examples, the network encoded packet transmitter 1310 maytransmit the updated set of one or more network encoded packets to theplurality of UEs. In some examples, the network encoded packettransmitter 1310 may continue to update and transmit the updated set ofone or more network encoded packets based on additional feedbackreceived from the one or more of the plurality of UEs until the updatedset of one or more network encoded packets is empty. In some examples,the network encoded packet transmitter 1310 may transmit the updated setof one or more network encoded packets via broadcast signaling based ona number of the plurality of UEs that have failed to decode each packetof the set of one or more network encoded packets being above athreshold amount. In some examples, the network encoded packettransmitter 1310 may transmit the updated set of one or more networkencoded packets via unicast signaling based on a number of the pluralityof UEs that have failed to decode each packet of the set of one or morenetwork encoded packets being below a threshold amount.

The feedback receiver 1315 may receive feedback from each of one or moreof the plurality of UEs, the feedback indicating, as respective subsetsof the set of one or more network encoded packets, a combination ofsuccessfully received network encoded packets of the set of one or morenetwork encoded packets and successfully decoded packets of the set ofone or more packets. In some examples, the feedback receiver 1315 mayreceive the feedback via a packet data convergence protocol (PDCP)status report, a RLC status report, or a HARQ message. In some examples,the feedback receiver 1315 may receive the feedback in a network codingsub-layer, where the feedback indicates a decoding status of each packetof the set of one or more packets. In some examples, the feedbackreceiver 1315 may receive a channel state information message inconjunction with the feedback. In some examples, the feedback receiver1315 may receive the channel state information message based on thefeedback indicating a negative acknowledgement for one or more of theset of one or more network encoded packets.

The decoding determination component 1320 may determine, based on thefeedback, a subset of the set of one or more network encoded packetsthat was successfully decoded for each of the one or more of theplurality of UEs providing feedback. In some examples, the decodingdetermination component 1320 may determine which of the successfullyreceived network encoded packets were successfully decoded so as to beadded to the successfully decoded packets. In some examples, thedecoding determination component 1320 may determine an intersection thesuccessfully decoded packets associated with each of the subsetsindicated in the feedback to identify the successfully decoded packetscommon to each of the subsets. In some examples, the decodingdetermination component 1320 may determine, based on the feedbackindicative of the successfully received network encoded packets, thesuccessfully decoded network encoded packets, or both a second subset ofthe set of one or more network encoded packets that was successfullydecoded at any of the one or more of the plurality of UEs providingfeedback, where the updated set of one or more network encoded packetsfurther excludes the second subset of the set of one or more networkencoded packets. In some examples, the decoding determination component1320 may determine a union of the successfully decoded packetsassociated with each of the subsets indicated in the feedback toidentify the second subset of the set of one or more network encodedpackets.

The network encoded packet generator 1325 may generate, based on thefeedback, an updated set of one or more network encoded packets based onan updated set of one or more packets, where the updated set of one ormore packets excludes successfully decoded packets included in each ofthe subsets.

The encoding metric determination component 1330 may determine one ormore encoding metrics for transmission of the updated set of one or morepackets based on the channel state information message. In someexamples, the encoding metric determination component 1330 may determinea modulation and coding scheme, an encoding rate, or both.

The network coding parameter component 1335 may transmit, to one or moreof the plurality of UEs, an indication of one or more network codingparameters, where at least the updated set of one or more networkencoded packets are transmitted to the plurality of UEs in accordancewith the one or more network coding parameters. In some examples, thenetwork coding parameter component 1335 may transmit an indication of anetwork coding algorithm, a network encoding function, a networkencoding matrix, a number of decoding iterations, or any combinationthereof. In some examples, the network coding parameter component 1335may transmit the one or more network coding parameters using mediumaccess control-control element (MAC-CE) signaling, downlink controlinformation signaling, radio resource control signaling, or anycombination thereof. In some examples, the network coding parametercomponent 1335 may transmit an indication to switch from one or moreprior network coding parameters to the one or more network codingparameters. In some examples, the network coding parameter component1335 may receive, from the one or more of the plurality of UEs, arequest for the one or more network coding parameters, where theindication of the one or more network coding parameters is transmittedbased on receiving the request. In some examples, the network codingparameter component 1335 may receive, the request using medium accesscontrol-control element (MAC-CE) signaling or uplink control informationsignaling.

The packet identification component 1340 may identify the set of one ormore packets from a packet pool scheduled for broadcast to the pluralityof UEs. In some examples, the packet identification component 1340 mayidentify one or more additional packets for broadcast to the pluralityof UEs based on the one or more additional packets being added to thepacket pool.

The encoding component 1345 may encode the set of one or more networkencoded packets according to a Luby transform (LT) code, where eachnetwork encoded packet of the set of one or more network encoded packetsis constructed from one or more packets of the set of one or morepackets identified for broadcast to the plurality of UEs according to adistribution. In some cases, the distribution includes an ideal solitondistribution, a robust soliton distribution, or any combination thereof.

FIG. 14 shows a diagram of a system 1400 including a device 1405 thatsupports feedback-based broadcasting of network coded packets withsidelink in accordance with aspects of the present disclosure. Thedevice 1405 may be an example of or include the components of device1105, device 1205, or a base station 105 as described herein. The device1405 may include components for bi-directional voice and datacommunications including components for transmitting and receivingcommunications, including a communication manager 1410, a networkcommunications manager 1415, a transceiver 1420, an antenna 1425, memory1430, a processor 1440, and an inter-station communications manager1445. These components may be in electronic communication via one ormore buses (e.g., bus 1450).

The communication manager 1410 may transmit, to a plurality of UEs, aset of one or more network encoded packets representing a set of one ormore packets identified for broadcast to the plurality of UEs; receivefeedback from each of one or more of the plurality of UEs, the feedbackindicating, as respective subsets of the set of one or more networkencoded packets, a combination of successfully received network encodedpackets of the set of one or more network encoded packets andsuccessfully decoded packets of the set of one or more packets;determine, based on the feedback, a subset of the set of one or morenetwork encoded packets that was successfully decoded for each of theone or more of the plurality of UEs providing feedback; generate, basedon the feedback, an updated set of one or more network encoded packetsbased on an updated set of one or more packets, where the updated set ofone or more packets excludes successfully decoded packets included ineach of the subsets; and transmit the updated set of one or more networkencoded packets to the plurality of UEs.

The network communications manager 1415 may manage communications withthe core network (e.g., via one or more wired backhaul links). Forexample, the network communications manager 1415 may manage the transferof data communications for client devices, such as one or more UEs 115.

The transceiver 1420 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1420 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1420 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1425.However, in some cases the device may have more than one antenna 1425,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1430 may include RAM and ROM. The memory 1430 may storecomputer-readable, computer-executable code 1435 including instructionsthat, when executed, cause the processor to perform various functionsdescribed herein. In some cases, the memory 1430 may contain, amongother things, a BIOS which may control basic hardware or softwareoperation such as the interaction with peripheral components or devices.

The code 1435 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1435 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1435 may not be directly executable by theprocessor 1440 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

The processor 1440 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1440 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into the processor 1440. The processor 1440 may beconfigured to execute computer-readable instructions stored in a memory(e.g., the memory 1430) to cause the device 1405 to perform variousfunctions (e.g., functions or tasks supporting feedback-basedbroadcasting of network coded packets with sidelink).

The inter-station communications manager 1445 may manage communicationswith other base station 105, and may include a controller or schedulerfor controlling communications with UEs 115 in cooperation with otherbase stations 105. For example, the inter-station communications manager1445 may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, the inter-station communications manager1445 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

By including or configuring the communication manager 1410 in accordancewith examples as disclosed herein, the device 1405 may supporttechniques for the device 1405 to reduce waste and duplication ofpackets by receiving feedback from multiple UEs 115 and excludingsuccessfully decoded packets from a set of one or more packetsretransmitted to the multiple UEs 115 in response to the feedback.

FIG. 15 shows a flowchart illustrating a method 1500 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The operations ofmethod 1500 may be implemented by a UE 115 or its components asdescribed herein. For example, the operations of method 1500 may beperformed by a communication manager as described with reference toFIGS. 7 through 10 . In some examples, a UE may execute a set ofinstructions to control the functional elements of the UE to perform thedescribed functions. Additionally or alternatively, a UE may performaspects of the described functions using special-purpose hardware.

At 1505, the UE may receive, as part of a broadcast from a network node,a first subset of one or more network encoded packets. The operations of1505 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1505 may be performed by anetwork encoded packet receiver as described with reference to FIGS. 7through 10 .

At 1510, the UE may receive, via a plurality of sidelink connectionswith a corresponding plurality of UEs, a second subset of one or morenetwork encoded packets forwarded after successful receipt by theplurality of UEs from the network node. The operations of 1510 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1510 may be performed by a sidelink packetreceiver as described with reference to FIGS. 7 through 10 .

At 1515, the UE may decode the first subset of one or more networkencoded packets and the second subset of one or more network encodedpackets. The operations of 1515 may be performed according to themethods described herein. In some examples, aspects of the operations of1515 may be performed by a packet decoder as described with reference toFIGS. 7 through 10 .

At 1520, the UE may determine, based on the decoding, a set of one ormore successfully decoded packets from the network node. The operationsof 1520 may be performed according to the methods described herein. Insome examples, aspects of the operations of 1520 may be performed by apacket decoder as described with reference to FIGS. 7 through 10 .

FIG. 16 shows a flowchart illustrating a method 1600 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The operations ofmethod 1600 may be implemented by a UE 115 or its components asdescribed herein. For example, the operations of method 1600 may beperformed by a communication manager as described with reference toFIGS. 7 through 10 . In some examples, a UE may execute a set ofinstructions to control the functional elements of the UE to perform thedescribed functions. Additionally or alternatively, a UE may performaspects of the described functions using special-purpose hardware.

At 1605, the UE may receive, as part of a broadcast from a network node,a first subset of one or more network encoded packets. The operations of1605 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1605 may be performed by anetwork encoded packet receiver as described with reference to FIGS. 7through 10 .

At 1610, the UE may receive, via a plurality of sidelink connectionswith a corresponding plurality of UEs, a second subset of one or morenetwork encoded packets forwarded after successful receipt by theplurality of UEs from the network node. The operations of 1610 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1610 may be performed by a sidelink packetreceiver as described with reference to FIGS. 7 through 10 .

At 1615, the UE may decode the first subset of one or more networkencoded packets and the second subset of one or more network encodedpackets. The operations of 1615 may be performed according to themethods described herein. In some examples, aspects of the operations of1615 may be performed by a packet decoder as described with reference toFIGS. 7 through 10 .

At 1620, the UE may determine, based on the decoding, a set of one ormore successfully decoded packets from the network node. The operationsof 1620 may be performed according to the methods described herein. Insome examples, aspects of the operations of 1620 may be performed by apacket decoder as described with reference to FIGS. 7 through 10 .

At 1625, the UE may transmit feedback to the network node, where thefeedback indicates the first and second subsets of network encodedpackets or the set of one or more successfully decoded packets. Theoperations of 1625 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1625 may beperformed by a feedback transmitter as described with reference to FIGS.7 through 10 .

FIG. 17 shows a flowchart illustrating a method 1700 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The operations ofmethod 1700 may be implemented by a UE 115 or its components asdescribed herein. For example, the operations of method 1700 may beperformed by a communication manager as described with reference toFIGS. 7 through 10 . In some examples, a UE may execute a set ofinstructions to control the functional elements of the UE to perform thedescribed functions. Additionally or alternatively, a UE may performaspects of the described functions using special-purpose hardware.

At 1705, the UE may receive, as part of a broadcast from a network node,a first subset of one or more network encoded packets. The operations of1705 may be performed according to the methods described herein. In someexamples, aspects of the operations of 1705 may be performed by anetwork encoded packet receiver as described with reference to FIGS. 7through 10 .

At 1710, the UE may transmit the first subset of one or more networkencoded packets to a plurality of UEs via a plurality of sidelinkconnections. The operations of 1710 may be performed according to themethods described herein. In some examples, aspects of the operations of1710 may be performed by a sidelink packet transmitter as described withreference to FIGS. 7 through 10 .

At 1715, the UE may receive, via the plurality of sidelink connectionswith the plurality of UEs, a second subset of one or more networkencoded packets forwarded after successful receipt by the plurality ofUEs from the network node. The operations of 1715 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1715 may be performed by a sidelink packet receiver asdescribed with reference to FIGS. 7 through 10 .

At 1720, the UE may decode the first subset of one or more networkencoded packets and the second subset of one or more network encodedpackets. The operations of 1720 may be performed according to themethods described herein. In some examples, aspects of the operations of1720 may be performed by a packet decoder as described with reference toFIGS. 7 through 10 .

At 1725, the UE may determine, based on the decoding, a set of one ormore successfully decoded packets from the network node. The operationsof 1725 may be performed according to the methods described herein. Insome examples, aspects of the operations of 1725 may be performed by apacket decoder as described with reference to FIGS. 7 through 10 .

FIG. 18 shows a flowchart illustrating a method 1800 that supportsfeedback-based broadcasting of network coded packets with sidelink inaccordance with aspects of the present disclosure. The operations ofmethod 1800 may be implemented by a base station 105 or its componentsas described herein. For example, the operations of method 1800 may beperformed by a communication manager as described with reference toFIGS. 11 through 14 . In some examples, a base station may execute a setof instructions to control the functional elements of the base stationto perform the described functions. Additionally or alternatively, abase station may perform aspects of the described functions usingspecial-purpose hardware.

At 1805, the base station may transmit, to a plurality of UEs, a set ofone or more network encoded packets representing a set of one or morepackets identified for broadcast to the plurality of UEs. The operationsof 1805 may be performed according to the methods described herein. Insome examples, aspects of the operations of 1805 may be performed by anetwork encoded packet transmitter as described with reference to FIGS.11 through 14 .

At 1810, the base station may receive feedback from each of one or moreof the plurality of UEs, the feedback indicating, as respective subsetsof the set of one or more network encoded packets, a combination ofsuccessfully received network encoded packets of the set of one or morenetwork encoded packets and successfully decoded packets of the set ofone or more packets. The operations of 1810 may be performed accordingto the methods described herein. In some examples, aspects of theoperations of 1810 may be performed by a feedback receiver as describedwith reference to FIGS. 11 through 14 .

At 1815, the base station may determine, based on the feedback, a subsetof the set of one or more network encoded packets that was successfullydecoded for each of the one or more of the plurality of UEs providingthe feedback. The operations of 1815 may be performed according to themethods described herein. In some examples, aspects of the operations of1815 may be performed by a decoding determination component as describedwith reference to FIGS. 11 through 14 .

At 1820, the base station may generate, based on the feedback, anupdated set of one or more network encoded packets based on an updatedset of one or more packets, where the updated set of one or more packetsexcludes successfully decoded packets included in each of the subsets.The operations of 1820 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1820may be performed by a network encoded packet generator as described withreference to FIGS. 11 through 14 .

At 1825, the base station may transmit the updated set of one or morenetwork encoded packets to the plurality of UEs. The operations of 1825may be performed according to the methods described herein. In someexamples, aspects of the operations of 1825 may be performed by anetwork encoded packet transmitter as described with reference to FIGS.11 through 14 .

The following provides an overview of aspects of the present disclosure:

Aspect 1: A method for wireless communication at a UE, comprising:receiving, as part of a broadcast from a network node, a first subset ofone or more network encoded packets; receiving, via a plurality ofsidelink connections with a corresponding plurality of UEs, a secondsubset of one or more network encoded packets forwarded after successfulreceipt by the plurality of UEs from the network node; decoding thefirst subset of one or more network encoded packets and the secondsubset of one or more network encoded packets; and determining, based onthe decoding, a set of one or more successfully decoded packets from thenetwork node.

Aspect 2: The method of aspect 1, further comprising: transmittingfeedback to the network node, wherein the feedback indicates the firstand second subsets of network encoded packets or the set of one or moresuccessfully decoded packets.

Aspect 3: The method of any of aspects 1 through 2, further comprising:transmitting the first subset of one or more network encoded packets tothe plurality of UEs via the plurality of sidelink connections.

Aspect 4: The method of any of aspects 1 through 3, further comprising:transmitting a channel state information message in conjunction withtransmitting feedback to the network node.

Aspect 5: The method of aspect 4, wherein the feedback comprises atleast one negative acknowledgement message, at least one acknowledgementmessage, or both.

Aspect 6: The method of any of aspects 1 through 5, further comprising:receiving an indication of one or more network coding parameters, theone or more network coding parameters including a network codingalgorithm, a network encoding function, a network encoding matrix, anumber of decoding iterations, or any combination thereof.

Aspect 7: The method of aspect 6, wherein receiving the indication ofthe one or more network coding parameters comprises: receiving the oneor more network coding parameters using medium access control (MAC)control element signaling, downlink control information signaling, radioresource control signaling, or any combination thereof.

Aspect 8: The method of any of aspects 6 through 7, wherein receivingthe indication of the one or more network coding parameters comprises:receiving an indication to switch from one or more prior network codingparameters to the one or more network coding parameters.

Aspect 9: The method of any of aspects 6 through 8, further comprising:transmitting, to the network node, a request for the one or more networkcoding parameters, wherein the indication of the one or more networkcoding parameters is received based at least in part on transmitting therequest.

Aspect 10: The method of aspect 9, wherein transmitting the requestcomprises: transmitting the request using medium access control (MAC)control element signaling or uplink control information signaling.

Aspect 11: The method of any of aspects 1 through 10, furthercomprising: receiving a third subset of one or more network encodedpackets from the network node based at least in part on transmittingfeedback to the network node, wherein the third subset of one or morenetwork encoded packets is different from the first subset of one ormore network encoded packets and the second subset of one or morenetwork encoded packets.

Aspect 12: The method of aspect 11, wherein the third subset of one ormore network encoded packets is provided via broadcast signaling.

Aspect 13: The method of any of aspects 11 through 12, wherein the thirdsubset of one or more network encoded packets is provided via unicastsignaling.

Aspect 14: The method of any of aspects 1 through 13, furthercomprising: transmitting feedback to the network node via a packet dataconvergence protocol (PDCP) status report, an RLC status report, or anHARQ message.

Aspect 15: The method of any of aspects 1 through 14, furthercomprising: transmitting feedback to the network node in a networkcoding sub-layer, wherein the feedback indicates a decoding status ofeach packet of the set of one or more successfully decoded packets.

Aspect 16: A method for wireless communication at a network node,comprising: transmitting, to a plurality of UEs, a set of one or morenetwork encoded packets representing a set of one or more packetsidentified for broadcast to the plurality of UEs; receiving feedbackfrom each of one or more of the plurality of UEs, the feedbackindicating, as respective subsets of the set of one or more networkencoded packets, a combination of successfully received network encodedpackets of the set of one or more network encoded packets andsuccessfully decoded packets of the set of one or more packets;determining, based at least in part on the feedback, a subset of the setof one or more network encoded packets that was successfully decoded foreach of the one or more of the plurality of UEs providing the feedback;generating, based at least in part on the feedback, an updated set ofone or more network encoded packets based at least in part on an updatedset of one or more packets, wherein the updated set of one or morepackets excludes successfully decoded packets included in each of thesubsets; and transmitting the updated set of one or more network encodedpackets to the plurality of UEs.

Aspect 17: The method of aspect 16, wherein determining the subset ofthe set of one or more network encoded packets that was successfullydecoded comprises: determining which of the successfully receivednetwork encoded packets were successfully decoded so as to be added tothe successfully decoded packets.

Aspect 18: The method of any of aspects 16 through 17, furthercomprising: continuing to update and transmit the updated set of one ormore network encoded packets based on additional feedback received fromthe one or more of the plurality of UEs until the updated set of one ormore network encoded packets is empty.

Aspect 19: The method of any of aspects 16 through 18, whereindetermining the subset of the set of one or more network encoded packetscomprises: determining an intersection the successfully decoded packetsassociated with each of the subsets indicated in the feedback toidentify the successfully decoded packets common to each of the subsets.

Aspect 20: The method of any of aspects 16 through 19, furthercomprising: determining, based at least in part on the feedbackindicative of the successfully received network encoded packets, thesuccessfully decoded network encoded packets, or both a second subset ofthe set of one or more network encoded packets that was successfullydecoded at any of the one or more of the plurality of UEs providing thefeedback, wherein the updated set of one or more network encoded packetsfurther excludes the second subset of the set of one or more networkencoded packets.

Aspect 21: The method of aspect 20, wherein determining the secondsubset of the set of one or more network encoded packets comprises:determining a union of the successfully decoded packets associated witheach of the subsets indicated in the feedback to identify the secondsubset of the set of one or more network encoded packets.

Aspect 22: The method of any of aspects 16 through 21, wherein receivingthe feedback comprises: receiving the feedback via a packet dataconvergence protocol (PDCP) status report, an RLC status report, or anHARQ message.

Aspect 23: The method of any of aspects 16 through 22, wherein receivingthe feedback comprises: receiving the feedback in a network codingsub-layer, wherein the feedback indicates a decoding status of eachpacket of the set of one or more packets.

Aspect 24: The method of any of aspects 16 through 23, furthercomprising: receiving a channel state information message in conjunctionwith the feedback; and determining one or more encoding metrics fortransmission of the updated set of one or more packets based at least inpart on the channel state information message.

Aspect 25: The method of aspect 24, wherein determining the one or moreencoding metrics comprises: determining a modulation and coding scheme,an encoding rate, or both.

Aspect 26: The method of any of aspects 24 through 25, wherein receivingthe channel state information message comprises: receiving the channelstate information message based at least in part on the feedbackindicating a negative acknowledgement for one or more of the set of oneor more network encoded packets.

Aspect 27: The method of any of aspects 16 through 26, furthercomprising: transmitting, to one or more of the plurality of UEs, anindication of one or more network coding parameters, wherein at leastthe updated set of one or more network encoded packets are transmittedto the plurality of UEs in accordance with the one or more networkcoding parameters.

Aspect 28: The method of aspect 27, wherein transmitting the indicationof the one or more network coding parameters comprises: transmitting anindication of a network coding algorithm, a network encoding function, anetwork encoding matrix, a number of decoding iterations, or anycombination thereof.

Aspect 29: The method of any of aspects 27 through 28, whereintransmitting the indication of the one or more network coding parameterscomprises: transmitting the one or more network coding parameters usingmedium access control-control element (MAC-CE) signaling, downlinkcontrol information signaling, radio resource control signaling, or anycombination thereof.

Aspect 30: The method of any of aspects 27 through 29, whereintransmitting the indication of the one or more network coding parameterscomprises: transmitting an indication to switch from one or more priornetwork coding parameters to the one or more network coding parameters.

Aspect 31: The method of any of aspects 27 through 30, furthercomprising: receiving, from the one or more of the plurality of UEs, arequest for the one or more network coding parameters, wherein theindication of the one or more network coding parameters is transmittedbased at least in part on receiving the request.

Aspect 32: The method of any of aspects 16 through 31, whereintransmitting the updated set of one or more network encoded packetscomprises: transmitting the updated set of one or more network encodedpackets via broadcast signaling based at least in part on a number ofthe plurality of UEs that have failed to decode each packet of the setof one or more network encoded packets being above a threshold amount.

Aspect 33: The method of any of aspects 16 through 32, whereintransmitting the updated set of one or more network encoded packetscomprises: transmitting the updated set of one or more network encodedpackets via unicast signaling based at least in part on a number of theplurality of UEs that have failed to decode each packet of the set ofone or more network encoded packets being below a threshold amount.

Aspect 34: The method of any of aspects 16 through 33 wherein receivingthe request comprises: receiving, the request using medium accesscontrol-control element (MAC-CE) signaling or uplink control informationsignaling.

Aspect 35: The method of any of aspects 16 through 34, furthercomprising: identifying the set of one or more packets from a packetpool scheduled for broadcast to the plurality of UEs.

Aspect 36: The method of aspect 35, further comprising: identifying oneor more additional packets for broadcast to the plurality of UEs basedat least in part on the one or more additional packets being added tothe packet pool.

Aspect 37: The method of any of aspects 16 through 36, furthercomprising: encoding the set of one or more network encoded packetsaccording to a Luby transform (LT) code, wherein each network encodedpacket of the set of one or more network encoded packets is constructedfrom one or more packets of the set of one or more packets identifiedfor broadcast to the plurality of UEs according to a distribution.

Aspect 38: The method of aspect 37, wherein the distribution comprisesan ideal soliton distribution, a robust soliton distribution, or anycombination thereof.

Aspect 39: An apparatus for wireless communication at a UE, comprising aprocessor; memory coupled with the processor; and instructions stored inthe memory and executable by the processor to cause the apparatus toperform a method of any of aspects 1 through 15.

Aspect 40: An apparatus for wireless communication at a UE, comprisingat least one means for performing a method of any of aspects 1 through15.

Aspect 41: A non-transitory computer-readable medium storing code forwireless communication at a UE, the code comprising instructionsexecutable by a processor to perform a method of any of aspects 1through 15.

Aspect 42: An apparatus for wireless communication at a network node,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform a method of any of aspects 16 through 38.

Aspect 43: An apparatus for wireless communication at a network node,comprising at least one means for performing a method of any of aspects16 through 38.

Aspect 44: A non-transitory computer-readable medium storing code forwireless communication at a network node, the code comprisinginstructions executable by a processor to perform a method of any ofaspects 16 through 38.

It should be noted that the methods described herein describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may bedescribed for purposes of example, and LTE, LTE-A, LTE-A Pro, or NRterminology may be used in much of the description, the techniquesdescribed herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NRnetworks. For example, the described techniques may be applicable tovarious other wireless communications systems such as Ultra MobileBroadband (UMB), Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, aswell as other systems and radio technologies not explicitly mentionedherein.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the description may be represented byvoltages, currents, electromagnetic waves, magnetic fields or particles,optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connectionwith the disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, a CPU, an FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described herein. A general-purpose processor may be amicroprocessor, but in the alternative, the processor may be anyprocessor, controller, microcontroller, or state machine. A processormay also be implemented as a combination of computing devices (e.g., acombination of a DSP and a microprocessor, multiple microprocessors, oneor more microprocessors in conjunction with a DSP core, or any othersuch configuration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described herein may be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that may beaccessed by a general-purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude RAM, ROM, electrically erasable programmable ROM (EEPROM), flashmemory, compact disk (CD) ROM or other optical disk storage, magneticdisk storage or other magnetic storage devices, or any othernon-transitory medium that may be used to carry or store desired programcode means in the form of instructions or data structures and that maybe accessed by a general-purpose or special-purpose computer, or ageneral-purpose or special-purpose processor. Also, any connection isproperly termed a computer-readable medium. For example, if the softwareis transmitted from a website, server, or other remote source using acoaxial cable, fiber optic cable, twisted pair, digital subscriber line(DSL), or wireless technologies such as infrared, radio, and microwave,then the coaxial cable, fiber optic cable, twisted pair, DSL, orwireless technologies such as infrared, radio, and microwave areincluded in the definition of computer-readable medium. Disk and disc,as used herein, include CD, laser disc, optical disc, digital versatiledisc (DVD), floppy disk and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an example step that is described as “based on condition A”may be based on both a condition A and a condition B without departingfrom the scope of the present disclosure. In other words, as usedherein, the phrase “based on” shall be construed in the same manner asthe phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “example” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, known structures and devices are shown inblock diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person having ordinaryskill in the art to make or use the disclosure. Various modifications tothe disclosure will be apparent to a person having ordinary skill in theart, and the generic principles defined herein may be applied to othervariations without departing from the scope of the disclosure. Thus, thedisclosure is not limited to the examples and designs described herein,but is to be accorded the broadest scope consistent with the principlesand novel features disclosed herein.

What is claimed is:
 1. A method for wireless communication at a userequipment (UE), comprising: receiving, as part of a broadcast from anetwork node, a first subset of one or more network encoded packets;receiving, via a plurality of sidelink connections with a correspondingplurality of UEs, a second subset of the one or more network encodedpackets forwarded after successful receipt by the plurality of UEs fromthe network node; decoding the first subset of the one or more networkencoded packets and the second subset of the one or more network encodedpackets; determining, based on the decoding, a set of one or moresuccessfully decoded packets from the network node; and receiving athird subset of the one or more network encoded packets from the networknode based at least in part on transmitting feedback to the networknode, wherein the third subset of the one or more network encodedpackets is different from the first subset of the one or more networkencoded packets and the second subset of the one or more network encodedpackets.
 2. The method of claim 1, further comprising: transmitting thefirst subset of the one or more network encoded packets to the pluralityof UEs via the plurality of sidelink connections.
 3. The method of claim1, wherein the third subset of the one or more network encoded packetsis provided via broadcast signaling.
 4. The method of claim 1, whereinthe third subset of the one or more network encoded packets is providedvia unicast signaling.
 5. An apparatus for wireless communication at auser equipment (UE), comprising: a processor; and a memory coupled withthe processor, with instructions stored in the memory, the instructionsbeing executable by the processor to cause the apparatus to: receive, aspart of a broadcast from a network node, a first subset of one or morenetwork encoded packets; receive, via a plurality of sidelinkconnections with a corresponding plurality of UEs, a second subset ofthe one or more network encoded packets forwarded after successfulreceipt by the plurality of UEs from the network node; decode the firstsubset of the one or more network encoded packets and the second subsetof the one or more network encoded packets; determine, based on thedecoding, a set of one or more successfully decoded packets from thenetwork node; and receive a third subset of the one or more networkencoded packets from the network node based at least in part ontransmitting feedback to the network node, wherein the third subset ofthe one or more network encoded packets is different from the firstsubset of the one or more network encoded packets and the second subsetof the one or more network encoded packets.
 6. The apparatus of claim 5,wherein the instructions are further executable by the processor tocause the apparatus to: transmit the first subset of the one or morenetwork encoded packets to the plurality of UEs via the plurality ofsidelink connections.
 7. The apparatus of claim 5, wherein the thirdsubset of the one or more network encoded packets is provided viabroadcast signaling.
 8. The apparatus of claim 5, wherein the thirdsubset of the one or more network encoded packets is provided viaunicast signaling.
 9. An apparatus for wireless communication at a userequipment (UE), comprising: means for receiving, as part of a broadcastfrom a network node, a first subset of one or more network encodedpackets; means for receiving, via a plurality of sidelink connectionswith a corresponding plurality of UEs, a second subset of the one ormore network encoded packets forwarded after successful receipt by theplurality of UEs from the network node; means for decoding the firstsubset of the one or more network encoded packets and the second subsetof the one or more network encoded packets; means for determining, basedon the decoding, a set of one or more successfully decoded packets fromthe network node; and means for receiving a third subset of the one ormore network encoded packets from the network node based at least inpart on transmitting feedback to the network node, wherein the thirdsubset of the one or more network encoded packets is different from thefirst subset of the one or more network encoded packets and the secondsubset of the one or more network encoded packets.
 10. The apparatus ofclaim 9, further comprising: means for transmitting the first subset ofthe one or more network encoded packets to the plurality of UEs via theplurality of sidelink connections.
 11. The apparatus of claim 9, whereinthe third subset of the one or more network encoded packets is providedvia broadcast signaling.
 12. The apparatus of claim 9, wherein the thirdsubset of the one or more network encoded packets is provided viaunicast signaling.
 13. A non-transitory computer-readable medium storingcode for wireless communication at a user equipment (UE), the codecomprising instructions executable by a processor to: receive, as partof a broadcast from a network node, a first subset of one or morenetwork encoded packets; receive, via a plurality of sidelinkconnections with a corresponding plurality of UEs, a second subset ofthe one or more network encoded packets forwarded after successfulreceipt by the plurality of UEs from the network node; decode the firstsubset of the one or more network encoded packets and the second subsetof the one or more network encoded packets; determine, based on thedecoding, a set of one or more successfully decoded packets from thenetwork node; and receive a third subset of the one or more networkencoded packets from the network node based at least in part ontransmitting feedback to the network node, wherein the third subset ofthe one or more network encoded packets is different from the firstsubset of the one or more network encoded packets and the second subsetof the one or more network encoded packets.
 14. The non-transitorycomputer-readable medium of claim 13, wherein the instructions arefurther executable by the processor to cause the apparatus to: transmitthe first subset of the one or more network encoded packets to theplurality of UEs via the plurality of sidelink connections.
 15. Thenon-transitory computer-readable medium of claim 13, wherein the thirdsubset of the one or more network encoded packets is provided viabroadcast signaling.
 16. The non-transitory computer-readable medium ofclaim 13, wherein the third subset of the one or more network encodedpackets is provided via unicast signaling.